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原式为:(x+y)³-(x-y)²(x+y)
=(x+y)(x+y)²-(x+y)(x-y)²
=(x+y)【(x+y)²-(x-y)²】
=(x+y)2x2y
=4xy(x+y)
=(x+y)(x+y)²-(x+y)(x-y)²
=(x+y)【(x+y)²-(x-y)²】
=(x+y)2x2y
=4xy(x+y)
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解:原式=(x+y)((x+y)^2-(x-y)^2)
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
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解:(x+y)³-(x-y)²(x+y)=(x+y)[(x+y)²-(x-y)²]
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
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解:(x+y)^3-(x-y)^2(x+y)=(x+y)((x+y)^2-(x-y)^2)
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
=(x+y)(x+y+x-y)(x+y-x+y)
=4xy((x+y)
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