Question

简便计算:(x^2-1)/(x^2-2x+1)÷(x+1)/(x-1)·(1-x)/(x+1)

Answer 1

简便计算:(x^2-1)/(x^2-2x+1)÷(x+1)/(x-1)·(1-x)/(x+1)

=（x²-1）/(x-1)²×(x-1)/(x+1)×(1-x)/(x+1)

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

=(1-x)/(1+x);

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