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初中数学：m²+3m-1=0，怎么求式子的值？一元二次方程韦达定理
初中数学：m²+3m-1=0，怎么求式子的值？一元二次方程韦达定理
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119/168
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