6(x-y)3次方+15(y-x)的平方-9(y-x)的3次方？
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原式=6(x-y)³+15(x-y)²+9(x-y)³
=15(x-y)³+15(x-y)²
=15(x-y)²(x-y+1),3,SO,你想干嘛？化简？,2,6(x-y)³+15(y-x)²-9(y-x)³
=6(x-y)³+15(x-y)²+9(x-y)³
=15(x-y)³+15(x-y)²
=15(x-y)²(x-y+1),0,=6(x-y)³+15(x-y)²+9(x-y)³
=15(x-y)³+15(x-y)²,0,
=15(x-y)³+15(x-y)²
=15(x-y)²(x-y+1),3,SO,你想干嘛？化简？,2,6(x-y)³+15(y-x)²-9(y-x)³
=6(x-y)³+15(x-y)²+9(x-y)³
=15(x-y)³+15(x-y)²
=15(x-y)²(x-y+1),0,=6(x-y)³+15(x-y)²+9(x-y)³
=15(x-y)³+15(x-y)²,0,
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