-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简
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-(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
-(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
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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5x(x-y)+2y(x-y)
化简:5(x-y)+2(x+y)-3(x-y)
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（X+2Y)(5X-2Y)
(x+2y)(5x-2y)
4x+2y-5x-y
(2x-3y)-(5x-y)
(2X-3y)-(5x-y)
(x-y)^2+5(x-y)-14
(2x-5y)(3x+y)
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)
因式分解x(x+y)(x-y)-x(x+y)^2
(2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2