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你也会犯这个错误吗？一元二次方程有实数根，求参数K的负整数值
九年级数学：你也会犯这个错误吗？一元二次方程有实数根，怎么求参数K的负整数值？
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36/168
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