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数学7上：把A+B错看成A-B结果是-3x²-2x-1，求出A+B的正确结果？
数学7上：把A+B错看成A-B结果是-3x²-2x-1，求出A+B的正确结果？
七年级数学，代数式，单项式，多项式，整式加减，化简培优专题107/164
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