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(x+y)^2(x-y)+(x+y)(x-y)^2
=(x+y)(x-y)(x+y+x-y)
=(x+y)(x-y)*2x
=2x^3-2xy^2
=(x+y)(x-y)(x+y+x-y)
=(x+y)(x-y)*2x
=2x^3-2xy^2
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=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
=2x(x+y)(x-y)
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展开全部
(x+y)^2(x-y)+(x+y)(x-y)^2
=(x+y)(x-y)【(x+y)+(x-y)】
=(x+y)(x-y)*2x
=2x^3-2xy^2
=(x+y)(x-y)【(x+y)+(x-y)】
=(x+y)(x-y)*2x
=2x^3-2xy^2
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(x+y)^2(x-y)+(x+y)(x-y)^2
=(x+y)(x-y)(x+y+x-y)
=2x(x^2-y^2)
=2x^3-2xy^2
=(x+y)(x-y)(x+y+x-y)
=2x(x^2-y^2)
=2x^3-2xy^2
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