作乘法:(x+y)(x²-xy+y²);(x-y)(x²+xy+y²)

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作乘法:(x+y)(x²-xy+y²);(x-y)(x²+xy+y²)作乘法:(x+y)(x²-xy+y²);(x-y)(x²+x

作乘法:(x+y)(x²-xy+y²);(x-y)(x²+xy+y²)
作乘法:(x+y)(x²-xy+y²);(x-y)(x²+xy+y²)

作乘法:(x+y)(x²-xy+y²);(x-y)(x²+xy+y²)
这是立方差公式:(x+y)(x²-xy+y²)=X3+Y3;(x-y)(x²+xy+y²)=X3-Y3;公式不好打,那3就是3次冥.