
(x+y)的三次方-(x的平方-y的平方)(x-y)
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(x+y)的三次方-(x的平方-y的平方)(x-y)
=(x+y)^3-(x+y)(x-y)(x-y)
=(x+y)[(x+y)²-(x-y)²]
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy(x+y)
=(x+y)^3-(x+y)(x-y)(x-y)
=(x+y)[(x+y)²-(x-y)²]
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy(x+y)
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