x的三次方-y的三次方-x的平方y+xy的平方
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解
x³-y³-x²y+xy²
=(x³-y³)-(x²y-xy²)
=(x-y)(x²+xy+y²)-xy(x-y)
=(x-y)(x²+xy+y²-xy)
=(x-y)(x²+y²)
x³-y³-x²y+xy²
=(x³-y³)-(x²y-xy²)
=(x-y)(x²+xy+y²)-xy(x-y)
=(x-y)(x²+xy+y²-xy)
=(x-y)(x²+y²)
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