※ 引述《u2150260 (鴻哥)》之銘言：
: ∞
: 1. Let Bn be a countable set ,n=1,2......Show that ∪Bn is countable
: n=1
: 2.find the inverse function of the function f(x)= e^x/x - 2e^(-x)
: 3.Let f(x,y)=cos^2x /2 +y^2 -ycosx -y/2 +1 Find (x0,y0) such that
: f(x0,y0)≦f(x,y) for all x and y and the value of f(x0,y0)
1 跟自然數對到有理數的方法一樣
3 微分求極值
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