x的三次方+x的二次方y-xy的二次方-y的三次方
问题描述：
x的三次方+x的二次方y-xy的二次方-y的三次方
答
x³+x²y-xy²-y³
=x²(x+y)-y²(x+y)
=(x+y)(x²-y²)
=(x+y)(x+y)(x-y)
=(x+y)²(x-y)
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