(x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程
问题描述:
(x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)的计算过程
答
(x-y)^2+7(x+y)-11(x-y)^2-8(X+Y)
=(1-11)(x-y)^2+(7-8)(x+y)
=-10(x-y)^2-(x+y)