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数学7上：多项式mxy+2x-3y-1-4xy是三项式，怎么求m²-m+2的值？
数学7上：多项式mxy+2x-3y-1-4xy是三项式，怎么求m²-m+2的值？
七年级数学，代数式，单项式，多项式，整式加减，化简培优专题134/164
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