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一次函数竞赛题

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一次函数竞赛题一次函数竞赛题 一次函数竞赛试题 一(选择题: 1(直线y,3X,b 与两坐标轴围成的三角形面积为6,求与Y轴的交点坐 标 ……………………………( ) A、(0,2) B、(0,,2) (0,2) C、(0,6) D、(0,6)、(0,,6) 2(已知一次函数Y,KX,b ,当x =0时,y 0,那么下列结论正确的是 ( ) A、k >0,b >0 B、k >0,b 0 D、k 1 D、k>1或k< 333 6(一次函数y=ax+b(a为整数)的图象过点(98,19),交x轴于(p,0),交y轴于(0,q),若...
一次函数竞赛题
一次函数竞赛题 一次函数竞赛试题 一(选择题: 1(直线y,3X,b 与两坐标轴围成的三角形面积为6,求与Y轴的交点坐 标 ……………………………( ) A、(0,2) B、(0,,2) (0,2) C、(0,6) D、(0,6)、(0,,6) 2(已知一次函数Y,KX,b ,当x =0时,y <0;,当y =0时,x >0,那么下列结论正确的是 ( ) A、k >0,b >0 B、k >0,b <0 C、k <0,b >0 D、k <0,b <0 3(某人骑车沿直线旅行,先前进了千米,休息了一段时间,又原路返回千米(),再前进千米,则此人离起点的距离S与时间t的关系示意图是( )。 4(.如图1,在一次函数的图象上取点P,作PA?x轴,PB?y轴;垂足为B,且y,,x,3 矩形OAPB的面积为2,则这样的点P共有( ) )3个(C)2个(D)1个 (A) 4个(B 4(在直角坐标系中,已知A,1,1,,在x轴上确定点P,使?AOP为等腰三角形,则符合条件的点P共有, ,个 ,A,1个 ,B,2个 ,C,3个 ,D,4个 5(若直线y=3x-1与y=x-k的交点在第四象限,则k的取值范围是( ) 111A、k< B、 < k <1 C、k>1 D、k>1或k< 333 6(一次函数y=ax+b(a为整数)的图象过点(98,19),交x轴于(p,0),交y轴于(0,q),若p为质数,q为正整数,那么满足条件的一次函数的个数为( ) A. 0 B.1 C.2 D.无数 7(当,1??2时,函数满足,则常数的取值范围是( ) xay,ax,6y,10 ,4,a,00,a,2,4,a,2a,0,4,a,2A、 B、 C、且 D、 8(过点P(-1,3)作直线,使它与两坐标轴围成的三角形面积为5,这样的直线可以作( ) (A) 4条 (B) 3条 (C) 2条 (D) 1条 9(在直角坐标系中,横坐标都是整数的点称为整点,设k为整数,当直线y=x,3与y=kx+k 的交点为整数时,k的值可以取( ) (A)2个 (B)4个 (C)6个 (D)8个 10(甲、乙二人在如图所示的斜坡AB上作往返跑训练( 1b已知:甲上山的速度是a米/分,下山的速度是b米/分,(a,;乙上山的速度是a米/,2分,下山的速度是2b米/分(如果甲、乙二人同时从点A出发,时间为t(分),离开点A的路程为S(米)(那么下面图象中,大致表示甲、乙二人从点A出发后的时间t(分)与离personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political 开点A的路程S(米)之间的函数关系的是( ) S(米) S(米) S(米) S(米) O (分) tO OO t(分) t(分) t(分) (D) (C) (A) (B) 二(填空题: 11(某市市内电话费y(元)与通话时间 t(分钟)之间的函数关系图象如图 所示,则通话7分钟需付电话费 元。 12(函数的自变量x的取值范围是_____。 b13(若直线与直线的交点坐标是(,), a323x,457y,1103177x,543y,897 22则a,2004b的值是 14(某公司规定一个退休职工每年可获得一份退休金,金额与他工作的年数的算术平方根成正比例,如果他多工作a年,他的退休金比原有的多p元,如果他多工作b年(b?a),他的退休金比原来的多q元,那么他每年的退休金是(以a、b、p、q表示) 元( 15.若一次函数y,kx,b,当,3?x?1时,对应的y值为1?y?9,则一次函数的解析式为________________________. 16(据有关统计,两个城市之间每天的电话通话次数T与这两个城市的人口数m、n(单 kmn位:万人)以及两个城市间的距离d(单位:km)有T=的关系(k为常数)。现测得A、2d B、C三个城市的人口及它们之间的距离如图所示,且已知A、B两个城市间每天的电话通话次数为t,那么B、C两个城市间每天的电话次数为 次(用t表示)。 yA人口50万 PB160km 240kmxOA BC 人口80万320km人口100万 17(如图,在一次函数的图象上取点P,作PA?x轴,PB?y轴;垂足为B,且矩y,,x,3 形OAPB的面积为2,则这样的点P共有___________个. 18(一个游泳池的形状如下面左边第一个图所示,现在以固定的流量向游泳池内注水,那么能够大致表示水高h与时间t的关系应是在下面右边六个图像中的,,,(填标号)。 isciplrs are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation dsential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each membeis es and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education,us of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules e focry to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is thmember of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do t lifiedical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a quad further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of praction ann, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflectg reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussiopersonal and collective learning on your own, combining learnin2General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political nce XI, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenaffectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theoryn of etold four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learine qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four 三(解答题: 19. 已知写文章、出版图书所获得稿费的纳税计算方法是 (x,800),20%,(1,30%),x,400, 其中表示稿费为元应缴纳的f(x),xf(x),x,(1,20%),20%,(1,30%),x,400, 税额。假如张三取得一笔稿费,缴纳个人所得税后,得到7104元,问张三的这笔稿费是多少元, 20(某矿泉水厂生产一种矿泉水,经测算,用一吨水生产的矿泉水所获利润y(元)与1吨水的价格x(元)的关系如图所示。 (1)求y与x的函数关系式及自变量x的取值范围; y (2)为节约用水,特规定:该厂日用水量不超过20吨时, 180 水价为每吨4元;日用水量超过20吨时,超过部分按每吨 40元收费。已知该厂日用水量不少于20吨。设该厂日用水 量为t 吨,当日所获利润为w元。求w与t的函数关系式; 若该厂加强管理,积极节水,使日用水量不超过25吨,但 x 0 仍不少于20吨,求该厂的日利润的取值范围。 180 personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political 21(在某文具商场中,每个画夹定价为20元,每盒水彩定价为5元。为促进销售,商场制定两种优惠:一种是买一个画夹赠送一盒水彩;另一种是按总价92,付款。一个美术教师欲购买画夹4个,水彩若干盒(不少于4盒)。 (1)设购买水彩数量为x(盒),付款总金额为y(元),分别建立两种优惠方案中的y与x的函数关系式; (2)如果购买同样多的水彩,哪种方案更省钱, 22(某中学预计用1500元购买甲商品x个,乙商品y个,不料甲商品每个涨价1.5元,乙商品每个涨价1元,尽管购买甲商品的个数比预定减少10个,总金额多用29元.又若甲商品每个只涨价1元,并且购买甲商品的数量只比预定数少5个,那么买甲、乙两商品支付的总金额是1563.5元.(1)求x、y的关系式;(2)若预计购买甲商品的个数的2倍与预计购买乙商品的个数的和大于205,但小于210,求x,y的值. sential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each membeis es and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education,us of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules e focry to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is thmember of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do t lifiedical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a quad further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of praction ann, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflectg reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussiopersonal and collective learning on your own, combining learnin4General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political nce XI, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenaffectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theoryn of etold four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learine qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four isciplrs are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation d 12n1,n,24,,, ,,,,,Cn,11n25,n,4823(某出版公司为一本畅销书定价如下: , ,,,10nn,49, 这里的n表示订购书的数量,C(n)是订购书所付的钱款数(单位:元) (1)有多少个n,会出现买多于n本书比恰好买本书所花的钱少? (2)若一本书的成本是5元,现在两个人来买书,每人至少买一本,两人共买60本,则出版公司最少能赚多少钱?最多能赚多少钱? 324(某市为了节约用水,规定:每户每月用水量不超过最低限量am时,只付基本费8元 3am和定额损耗费c元(c?5);若用水量超过时,除了付同上的基本费和损耗费外,超过 3m部分每1付b元的超额费。 某市一家庭今年一月份、二月份和三月份的用水量和支付费用如下表所示: 3 交水费(元) m用水量() 一月份 9 9 二月份 15 19 三月份 22 33 根据上表的中的数据,求a、b、c。 personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political 25(A市、B市和C市有某种机器10台、10台、8台,现在决定把这些机器支援给D市18台,E市10台。已知:从A市调运一台机器到D市、E市的运费为200元和800元;从B市调运一台机器到D市、E市的运费为300元和700元;从C市调运一台机器到D市、E市的运费为400元和500元。 (1)设从A市、B市各调x台到D市,当28台机器调运完毕后,求总运费W(元)关于x(台)的函数关系式,并求W的最大值和最小值。 台到D市,B市调y台到D市,当28台机器调运完毕后,用x、y表示(2)设从A市调x 总运费W(元),并求W的最大值和最小值。 26(通过实验研究,专家们发现,初中学生听课的注意力指标数是随着老师讲课时间的变化而变化的,讲课开始时,学生的兴趣激增,中间有一端时间,学生的兴趣保持平稳的状态,随后开始分散,学生注意力指标数y随时间x(分钟)变化的函数图象如图所示(y越大 x?20和表示学生注意力越集中)。当0?x?10时,图象是抛物线的一部分,当10?20?x?40时,图象是线段。 (1)当0?x?10时,求注意力指标数y与时间x的函数关系式; (2)一道数学竞赛题,需讲解24分钟,问老师能否经过适当安排,使学生在听这道题时,注意力的指标数都不低于36。 n of etold four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learine qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four isciplrs are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation dsential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each membeis es and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education,us of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules e focry to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is thmember of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do t lifiedical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a quad further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of praction ann, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflectg reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussiopersonal and collective learning on your own, combining learnin6General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political nce XI, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenaffectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory 2kx,ax,bk27(已知:不论k取什么实数,关于x的方程(a、b是常数)的根总,,136 是x,1,试求a、b的值。 personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political 一次函数竞赛辅导 一(1(D 2.B 3.C 4.D 5.B 6.A 7.D 8.C 9.C 10.C 二(11(1元 12( 0?x?6且x?4 13.2008 22,?-,,14( 2(,,-,?) 15(y,2x,7或y,,2x,3 50,8016(解:据题意,有, t,k2160 32?. k,t5 因此,B、C两个城市间每天的电话通 话次数为 (第7题图) 80100325,tt,,,,,. TkBC25642320 17(4 18((2) (解:设稿费为元………………………………………………………2分 三(19x ?,7104,400 x ?………………………7分 x,f(x),x,x(1,20%)20%(1,30%) 417111x,x,,,x,,,7104……………………9分 5510125 111x,7104,,8000?(元) 125 答:这笔稿费是8000元。………………………………………………12分 20((1)y=-x+180 (0,x,180) (2)3500?w?4200 21( 解: (1)按优惠方案?可得 y=20×4+(x-4)×5=5x+60(x?4) …………2分 1 按优惠方案?可得 y=(5x+20×4)×92%=4.6x+73.6(x?4) …………4分 2 (2)比较 y-y=0.4x-13.6(x?4) 11 令y-y=0,得x=34 …………7分 11 ?当购买34盒水彩时,两种优惠方案付款一样多。 …………8分 当4?x<34时,y34时,y>y,优惠方案?付款较少。 …………10分 12 isciplrs are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation dsential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each membeis es and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education,us of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules e focry to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is thmember of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do t lifiedical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a quad further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of praction ann, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflectg reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussiopersonal and collective learning on your own, combining learnin8General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political nce XI, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenaffectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theoryn of etold four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learine qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four 22((1)设预计购买甲、乙商品的单价分别为a元和b元,则原是: ax+by=1500, ? 由甲商品单价上涨1.5元,乙商品单价上涨1元,并且甲商品减少10个情形,得: (a+1.5)(x-10)+(b+1)y=1529. ? 再由甲商品单价上涨1元,而数量比预计数少5个,乙商品单价上涨仍是1元的情形得: (a+1)(x-5)+(b+1)y=1563.5. ? 由?,?,?得: ?-?×2并化简,得x+2y=186. (2)依题意有: 205,2x+y,210及x+2y=186. 得54,y,. 由于y是整数,得y=55,从而得x=76. 23((1)2个n,24和48; (2)最少302元,最多384元。 3m24(解:设每月用水量为x,支付水费为y元。则 8,c,0,x,a       ?,y, ,8,b(x,a),c,x,a    ? , 由题意知:0,c?5 ? 0,8,c?13 33mm从表中可知,第二、三月份的水费均大于13元,故用水量15、22均大于最低限 3m量a,将x,15,x,22分别代入?式,得 personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political 19,8,b(15,a),c      ?, ,33,8,b(22,a),c      ?, 解得 b,2, 2a,c,19 ? 再分析一月份的用水量是否超过最低限量,不妨设9,a,将x,9代入?,得 9,8,2(9,a),c,即2a,c,17 ? ?与?矛盾。 故9?a,则一月份的付款方式应选?式,则8,c,9, ? c,1 代入?式得,a,10。 综上得 a,10,b,2,c,1。 25(解(1)由题设知,A市、B市、C市发往D市的机器台数分x,x,18-2x,发 往E市的机器台数分别为10-x,10-x,2x-10(于是 W=200x+300x+400(18-2x)+800(10-x)+700(10-x)+500(2x-10) =-800x+17200( ?5?x?9( ?W=-800x+17200(5?x?9,x是整数) 取到最小由上式可知,W是随着x的增加而减少的,所以当x=9时,W值10000元;当x=5时,W取到最大值13200元( (2)由题设知,A市、B市、C市发往D市的机器台数分别为x,y,18-x-y,发往E市的机器台数分别是10-x,10-y,x+y-10,于是 W=200x+800(10-x)+300y+700(10-y)+400(19-x-y)+500(x+y-10) =-500x-300y-17200 ?W=-500x-300y+17200, W=-200x-300(x+y)+17200 ?-200×10-300×18+17200=9800( 当x=10,y=8时,W=9800(所以,W的最小值为9800( 又W=-200x-300(x+y)+17200 ?-200×0-300×10+17200=14200( 当x=0,y=10时,W=14200,所以,W的最大值为14200( 20,x,1026(解:(1)当时,设抛物线的函数关系式为,由于它y,ax,bx,c 的图象经过点(0,20),(5,39),(10,48),所以 ine qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four isciplrs are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation dsential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each membeis es and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education,us of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules e focry to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is thmember of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do t lifiedical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a quad further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of praction ann, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflectg reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussiopersonal and collective learning on your own, combining learnin10General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political nce XI, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenaffectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theoryn of etold four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected lear c,20,, ,25a,5b,c,39, , ,100a,10b,c,48., 124(第11(A)题图) c,20解得,,,. a,,b,55 所以 12420,x,10,. …………………(5分) y,,x,x,2055 720,x,40(2)当时,. y,,x,765 12420,x,10所以,当时,令y=36,得, 36,,x,x,2055 x,20解得x=4,(舍去); 720,x,40当时,令 y=36,得36,,x,76,解得 5 2004x,,28. ……………………(10分) 77 4428,4,24,24因为,所以,老师可以经过适当的安排,在学生注意力指标77 数不低于36时,讲授完这道竞赛题. ……………………(15分) 27(解:把x,1代入原方程并整理得(b,4)k,7,2a b,4,0,要使等式(b,4)k,7,2a不论k取什么实数均成立,只有 ,7,2a,0, personal and collective learning on your own, combining learning reading and discussion, read, learn, and understanding of the original principles, focused learning around topics discussion, ongoing positive and negative type education. Members should close their own thoughts, work, real life, comparing reflection and further improve the pertinence and effectiveness of learning, continue to unlock the buttons, correct wrong, think of practical realization in mind, party rules discipline, firm and correct political orientation, develop discipline, and being a qualified member of the adherence to the Constitution Party rules and political discipline. Second, "to do" as the key, seriously, do try to do, to set an example. Two lies in the doing. To learn to do, and the unity of knowledge, qualified party member, is the focus of this study and education and essential point. A qualified party members not only to watch his Constitution Party rules and talk to learn how, through, dark and light, and also what does he end up doing, is not a unity. This study and education, is essential to enhance the party's political awareness, awareness of overall, core, par. In learning education in the, each members are to control "told political, and has faith, do political qualified; told rules, and has discipline, do implementation discipline qualified; told moral, and has conduct, do conduct qualified; told dedication, and has as, do play role qualified" "four told four has" this put ruler, often measure himself, view himself, transformation himself, with actual action reflected learn of effectiveness, and reflected belief faith of power. To firm to to Central par, to XI General Secretary par, to party of theory, and route, and approach par, to Central of the decision deployment par, strongly maintenance Central of authority, maintenance XI General Secretary this core, strongly obey Central of concentrated unified led, in thought, and political
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