(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)
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(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)(y-x)的二次方(x-y)+(x-y)
(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)
(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)
(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)
(y-x)的二次方(x-y)+(x-y)的三次方+2(x-y)的二次方(y-x)
=(x-y)²(x-y)+(x-y)³-2(x-y)²(x-y)
=(x-y)³+(x-y)³-2(x-y)³
=2(x-y)³-2(x-y)³
=0
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