(1减x-1分之1)乘(x+1分之x +1)除(1-1-x^2)

问题描述:

(1减x-1分之1)乘(x+1分之x +1)除(1-1-x^2)
(1减x-1分之1)乘(x+1分之x +1)除(1-1-x^2)咋算?

=(1-1/x-1)/-x^2
=-(1-1/x-1)/x^2
=-1/x^2+(1/x-1)/x^2
=1/x^2-x