x二次方（x-y)+2x(x-y)-(y-x)
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x二次方（x-y)+2x(x-y)-(y-x)x二次方（x-y)+2x(x-y)-(y-x)x二次方（x-y)+2x(x-y)-(y-x)原式=x²(x-y)+2x(x-y)+(x-y)=(
x二次方（x-y)+2x(x-y)-(y-x)
x二次方（x-y)+2x(x-y)-(y-x)
x二次方（x-y)+2x(x-y)-(y-x)
原式=x²(x-y)+2x(x-y)+(x-y)
=(x-y)(x²+2x+1)
=(x-y)(x+1)²
x^2(x-y)+2x(x-y)-(y-x)
=x^2(x-y)+2x(x-y)+(x-y)
=(x-y)(x^2+2x+1)
=(x-y)(x+1)^2
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