作业帮先化简 再求值 x^2-1/x^2-2x+1÷x+1/x-1×1-x/1+x
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先化简 再求值 x^2-1/x^2-2x+1÷x+1/x-1×1-x/1+x
先化简 再求值 x^2-1/x^2-2x+1÷x+1/x-1×1-x/1+x
先化简 再求值 x^2-1/x^2-2x+1÷x+1/x-1×1-x/1+x
=(x+1)(x-1)/(x-1)² ×(x-1)/(x+1) ×(1-x)/(1+x)
=(x+1)/(x-1) ×(x-1)/(x+1) ×(1-x)/(1+x)
=(1-x)/(1+x)