x+3/x²-1÷(x+3)(x-1)/-x²+2x-1,给计算下吧!

问题描述:

x+3/x²-1÷(x+3)(x-1)/-x²+2x-1,给计算下吧!

(x+3)/(x²-1)÷(x+3)(x-1)/(-x²+2x-1)
=-(x+3)/(x²-1)÷(x+3)(x-1)/(x-1)^2
=-1/(x+1)*1/(x-1)^2
=-1/[(x^2-1)(x-1)]