格#中
疑惑点
疑惑内容
课内探究学案
一、学习目标
1理解对数函数的概念,熟悉对数函数的图象与性质规律. 掌握比较同底数对数大小的方法
2掌握对数函数的性质.
学习重点:性质的应用
学习难点:性质的应用.
二、学习过程
探究点一 : 比较大小
例1比较下列各组数中两个值的大小:
⑴
; ⑵
;
⑶
解析:利用对数函数的单调性解.
解:略
点评:本题主要考察了利用函数的单调性比较对数的大小.
变式练习:比较下列各组中两个值的大小:
⑴
; ⑵
探究点二:求定义域、值域:
例3 求下列函数的定义域、值域:
⑴
⑵
⑶
⑷
EMBED Equation.3
解析:利用对数函数的性质解.
解:略
点评:本题主要考察了利用函数的定义域与值域.
三、反思总结
四、当堂检测
1.比较
0.7与
0.8两值大小
2.已知下列不等式,比较正数m、n的大小:
(1)
m<
n (2)
m>
n
(3)
m<
n(0<a<1) (4)
m>
n(a>1)
课后练习与提高
1、函数
的定义域是
(
)
A.
B.
C.
D.
2、设
(
)
A.
B.
C.
D.
3、已知
且
,则下列不等式中成立的是
(
)
A.
B.
C.
D.
3.方程lgx+lg(x+3)=1的解x=___________________.
4.已知f(x)的定义域为[0,1],则函数y=f[log
(3-x)]的定义域是__________.
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