（x+y)^3(x-y)-（x+y)(x-y)^3
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(x+y)^3(x-y)-(x+y)(x-y)^3=(x+y)(x-y)[(x+y)^2-(x-y)^2]=(x+y)(x-y)*4xy=4x^3y-4xy^3
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（x+y)^3(x-y)-（x+y)(x-y)^3
=(x+y)(x-y)[(x+y)²-(x-y)²]
=(x+y)(x-y)[(x+y)+(x-y)][(x+y)-(x-y)]
=4xy(x+y)(x-y)
=(x+y)(x-y)[(x+y)²-(x-y)²]
=(x+y)(x-y)[(x+y)+(x-y)][(x+y)-(x-y)]
=4xy(x+y)(x-y)
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=(x+y)(x-y)((x+y)^2-(x-y)^2)
=(x+y)(x-y)((x+y)+(x-y))((x+y)-(x-y))
=(x+y)(x-y)(2x)(2y)
=4xy(x^2-y^2)
=4x^3 y-4xy^3
=(x+y)(x-y)((x+y)+(x-y))((x+y)-(x-y))
=(x+y)(x-y)(2x)(2y)
=4xy(x^2-y^2)
=4x^3 y-4xy^3
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（x+y)^3(x-y)-（x+y)(x-y)^3
=(x+y)(x-y)[(x+y)^2-(x-y)^2)]
=4xy(x+y)(x-y)
=(x+y)(x-y)[(x+y)^2-(x-y)^2)]
=4xy(x+y)(x-y)
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(x+y)³(x-y)-(x+y)(x-y)³
= (x+y)(x-y) {(x+y)² - (x-y)²}
= (x+y)(x-y) (x+y+x-y)(x+y-x+y)
= 4xy(x+y)(x-y)
= (x+y)(x-y) {(x+y)² - (x-y)²}
= (x+y)(x-y) (x+y+x-y)(x+y-x+y)
= 4xy(x+y)(x-y)
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