(x-1)^2-(x-1)(x+5)=18
问题描述：
(x-1)^2-(x-1)(x+5)=18
答
x²-2x+1-x²-4x+5=18
-6x=12
x=-2
(x-1)^2-(x-1)(x+5)=18
x²-2x+1-x²-4x+5=18
-6x=12
x=-2