-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 04:23:21

-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简
-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简

-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简
(y-x)²
=[-1*(x-y)]²
=(-1)²*(x-y)²
=1*(x-y)²
=(x-y)²
所以原式=(-1-2-5+8)(x-y)²
=0

原式=(6m-1)xx+(4n+2)xy+2x+y+4
前两项时二次项
所以他们的系数为0
所以6m-1=0
4n+2=0
所以6m=1,2n=-1
所以6m-2n+2=0+1+2=3

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