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中考数学冲刺33：一元二次方程根与系数的关系？韦达定理整体代入
中考数学冲刺33：一元二次方程根与系数的关系，韦达定理整体代入非常简单。
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81/168
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