(x+y)²(x-y)+(x+y)(x-y)²=?
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解:原式=(x-y)(x+y)(x+y+x-y)
=2x(x-y)(x+y)
=2x(x-y)(x+y)
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(x+y)²(x-y)+(x+y)(x-y)²
=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
=2x(x^2-y^2)
=(x+y)(x-y)(x+y+x-y)
=2x(x+y)(x-y)
=2x(x^2-y^2)
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原式
=(x+y)(x-y)(x+y)-(x+y)(x-y)(x-y)
=(x+y)(x-y)(x+y-x+y)
=2y(x+y)(x-y)
=(x+y)(x-y)(x+y)-(x+y)(x-y)(x-y)
=(x+y)(x-y)(x+y-x+y)
=2y(x+y)(x-y)
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谢谢
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