已知A=3m²-2n²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C.
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![已知A=3m²-2n²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C.](/uploads/image/z/6965868-12-8.jpg?t=%E5%B7%B2%E7%9F%A5A%3D3m%26%23178%3B-2n%26%23178%3B%2Bmn%2CB%3D5mn-6m%26%23178%3B-9n%26%23178%3B%2C%E5%B9%B6%E4%B8%94A-B%2B3C%3D0%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8FC.)
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已知A=3m²-2n²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C.
已知A=3m²-2n²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C.
已知A=3m²-2n²+mn,B=5mn-6m²-9n²,并且A-B+3C=0,求多项式C.
你可以这样来解题,已知A,B的表达式,且A-B=3C,就是把A,B的表达式代进去,也就是,3m²-2n²+mn-(5mn-6m²-9n²)+3C=0,化简为9m²+7n²-4mn+3C=0,所以3C=9m²-7n²+4mn,最后C=3m²-三分之七n²+三分之四mn