分式不是这样表示的,（x-1)分之1,应该表示为：1/(x-1)你的题目应该是：[1+1/(x-1)]÷x/(x²-1) *2x/(x+1)=[(x-1)/(x-1)+1/(x-1)]÷x/[(x+1)(x-1)] *2x/(x+1)=x/(x-1)÷x/[(x+1)(x-1)] *2x/(x+1)=x/(x-1) *(x+1)(...