（x²-y²）（x+y)-（x-y）³
=(x-y)(x+y)(x+y)-(x-y)³
=(x-y)[(x+y)²-(x-y)²]
=(x-y)(x+y+x-y)(x+y-x+y)
=4xy(x-y)
(x²-y²)(x+y)-(x-y)³
=(x+y)(x-y)(x+y)-(x-y)³
=(x-y)((x+y)²-(x-y)²)
=(x-y)(x+y+x-y)(x+y-(x-y))
=(x-y)(2x)(2y)
=4xy(x-y)
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