(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)
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(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)(y-x)²(
(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)
(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)
(y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x)
解
(y-x)²(x-y)+(x-y)³+2(x-y)²(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