3-x/2x-4÷（x+2 - 5/x-2)
问题描述：
3-x/2x-4÷（x+2 - 5/x-2)
(1/x+1 + 1/x-1)÷ x/x+1
1/x+1 - x+3/x²-1 · x²-2x+1/x²+4x+3
（1/x - 1/2)÷（1- x²+4/4x ）
答
(3-x)/(2x-4)÷（x+2 - 5/x-2)=(3-x)/2(x-2)·( (x²-9)/(x-2))=-1/2(x+3)(1/(x+1) + 1/(x-1))÷ x/(x+1)=2x/(x²-1) *(x+1)/x=2/(x-1)1/(x+1) - (x+3)/(x²-1) ·( x²-2x+1)/(x²+4x+3)=-4/(x...