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九年级数学：关于x的一元二次方程，有一个解为0，怎么求m的值？
九年级数学：关于x的一元二次方程，有一个解为0，怎么求m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108/168
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