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九年级数学：配方法解一元二次方程，4x²+32x+28=0，基础训练
九年级数学：配方法解一元二次方程，4x²+32x+28=0，基础训练
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57/168
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