(x+y)的立方(x-y)-(x+y)(x-y)的立方
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(x+y)的立方(x-y)-(x+y)(x-y)的立方
(x+y)的立方(x-y)-(x+y)(x-y)的立方
(x+y)的立方(x-y)-(x+y)(x-y)的立方
(x+y)的立方(x-y)-(x+y)(x-y)的立方
=(x+y)(x-y)[(x+y)²-(x-y)²]
=(x²-y²)(x+y+x-y)(x+y-x+y)
=4xy(x+y)(x-y);
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