(x-1-(x+1分之8))÷(x²-1分之x²+2x-3)化简!
问题描述：
(x-1-(x+1分之8))÷(x²-1分之x²+2x-3)化简!
[x-1-(x+1分之8)]÷(x²-1分之x²+2x-3)化简、、速度、、
答
原式=[(x+1)(x-1)-8]/(x+1)÷(x+3)(x-1)/(x+1)(x-1)
=(x²-9)/(x+1)÷(x+3)/(x+1)
=(x+3)(x-3)/(x+1)*(x+1)/(x+3)
=x-3