因式分解:9(x-y)+(y-x)的三次方
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原式=9(x-y)-(x-y)^3
=(x-y)[9-(x-y)²]
=(x-y)(3+x-y)(3-x+y)
=-(x-y)(x-y+3)(x-y-3)
=(x-y)[9-(x-y)²]
=(x-y)(3+x-y)(3-x+y)
=-(x-y)(x-y+3)(x-y-3)
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=(x-y)[9-(x-y)²]
=(x-y)(3+x-y)(3-x+y)
=(x-y)(3+x-y)(3-x+y)
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