电脑用久了

输入符号   ≈≡≠＝≤≥＜＞≮≯∷±＋－×÷／∫∮∝∞∧∨∑∏∪∩∈∵∴⊥‖∠⌒⊙≌∽√  +:          plus(positive正的)-：        minus（negative负的）*：        multipliedby÷：       dividedby=:         beequalto≈:         beapproximatelyequalto():         roundbrackets(parenthess)[]:         squarebrackets{}:         braces∵:         because∴:         therefore≤:         lessthanorequalto≥：         greaterthanorequalto∞：         infinityLOGnX:   logxtothebasenxn:         thenthpowerofxf(x):         thefunctionofxdx:         diffrencialofxx+y:       xplusy(a+b):     bracketaplusbbracketcloseda=b:       aequalsba≠b：     aisn'tequaltoba>b:      aisgreaterthanba>>b:     aismuchgreaterthanba≥b:       aisgreaterthanorequaltobx→∞：   approchesinfinityx2:         x squarex3:         xcube√￣x:     thesquarerootofx3√￣x:   thecuberootofx3‰：   threepeimilln∑i=1xi: thesummationofxwherexgoesfrom1tonn∏i=1xi: theproductofxsubiwhereigoesfrom1ton∫ab:        integralbetweensaandb数学符号（理科符号）——运算符号   1.基本符号：＋ － × ÷（／）  2.分数号：／  3.正负号：±  4.相似全等：∽ ≌  5.因为所以：∵ ∴  6.判断类：＝ ≠ ＜ ≮（不小于） ＞ ≯（不大于）  7.集合类：∈（属于） ∪（并集） ∩（交集）  8.求和符号：∑  次方符号：¹（一次方） ²（平方） ³（立方） ⁴（4次方） ⁿ（n次方）  10.下角标:₁ ₂ ₃ ₄  (如:A₁B₂C₃D₄ 效果如何)  11.或与非的"非":￢  12.导数符号(备注符号):′ 〃  13.度:° ℃  14.任意:∀  15.推出号:⇒  16.等价号:⇔  17.包含被包含:⊆ ⊇ ⊂ ⊃  18.导数:∫ ∬  19.箭头类:↗ ↙ ↖ ↘ ↑ ↓ ↔ ↕ ↑ ↓ → ←  20.绝对值:｜  21.弧:⌒  22.圆:⊙ 11.或与非的"非":￢  12.导数符号(备注符号):′ 〃  13.度:° ℃  14.任意:∀  15.推出号:⇒  16.等价号:⇔  17.包含被包含:⊆ ⊇ ⊂ ⊃  18.导数:∫ ∬  19.箭头类:↗ ↙ ↖ ↘ ↑ ↓ ↔ ↕ ↑ ↓ → ←  20.绝对值:｜  21.弧:⌒  22.圆:⊙   α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω  Α Β Γ Δ Ε Ζ Η Θ Ι Κ ∧ Μ Ν Ξ Ο ∏ Ρ ∑ Τ Υ Φ Χ Ψ Ω  а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ  ы ь э ю я   А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ  Ы Ь Э Ю Я Δ