(x-y)²(x²+xy+y²)-(x³+y³)(-x³+y³)化简 10
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(x-y)²(x²+xy+y²)²-(x³+y³)(-x³+y³)
=(x-y)(x-y)(x²+xy+y²)²+(x³+y³)(x³-y³)
=(x³-y³)²+(x³+y³)(x³-y³)
=(x³-y³)(x³-y³+x³+y³)
=2x³(x³-y³)
=2x^6-2x³y³
=(x-y)(x-y)(x²+xy+y²)²+(x³+y³)(x³-y³)
=(x³-y³)²+(x³+y³)(x³-y³)
=(x³-y³)(x³-y³+x³+y³)
=2x³(x³-y³)
=2x^6-2x³y³
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