YLL討論網

由大嘴於星期四十一月 16, 2006 4:12 pm

y=S(x)=1
則y’=0
x^-1 y^2 + x^-1 y - 2x^-1 (y=1代入)
= x^-1 +x^-1- 2x^-1
=0

不知對不?

由 **鳳仙花** 於星期六八月 19, 2006 2:09 pm

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