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初中数学：用配方法解方程，2x²-5x-1=0，一元二次方程基础训练
初中数学：用配方法解方程，2x²-5x-1=0，一元二次方程基础训练
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46/168
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