计算,要写过程
4x³y+4x²y²+xy³=5a²b(x-y)³-30ab²(y-x)²=(a-b)...
4x³y+4x²y²+xy³=
5a²b(x-y)³-30ab²(y-x)²=
(a-b)³-(a-b)=
(x²+y²)²-4x²y²=
x²-2xy+y²-9= 展开
5a²b(x-y)³-30ab²(y-x)²=
(a-b)³-(a-b)=
(x²+y²)²-4x²y²=
x²-2xy+y²-9= 展开
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