因式分解:3m(x-y)-9n(y-x)
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因式分解:3m(x-y)-9n(y-x)因式分解:3m(x-y)-9n(y-x)因式分解:3m(x-y)-9n(y-x)=3m(x-y)+9n(x-y)=3(x-y)(m+3n)3m(x-y)-9n(
因式分解:3m(x-y)-9n(y-x)
因式分解:3m(x-y)-9n(y-x)
因式分解:3m(x-y)-9n(y-x)
=3m(x-y)+9n(x-y)
=3(x-y)(m+3n)
3m(x-y)-9n(y-x)
=(3m+9n)(x-y)
=3(m+3n)(x-y)
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因式分解:3m(x-y)-9n(y-x)
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