2/x+1-x-2/x²-1÷x²-2x/x²-2x+1计算
问题描述：
2/x+1-x-2/x²-1÷x²-2x/x²-2x+1计算
答
=2/(x+1)- (x-2)/(x+1)(x-1)×(x-1)²/x(x-2)
=2/(x+1)-(x-1)/x(x+1)
=2x/x(x+1)-(x-1)/x(x+1)
=(2x-x+1)/x(x+1)
=1/x