Question

（1-1/1+x）（1-1/x²）计算要过程

Answer 1

=[(1+x-1)/(1+x)]*[(x^2-1)/(x^2)]

=[x/(1+x)]*[(x+1)(x-1)/x^2]

=(x/x^2)*[(x+1)(x-1)/(1+x)]

=(1/x)*(x-1)

=(x-1)/x