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九年级数学：m，n是方程的两个实数根，怎么求m²-mn+3m+n的值？
九年级数学：m，n是方程的两个实数根，怎么求m²-mn+3m+n的值？
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题54/168
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