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九年级数学上册第22章一元二次方程22.2一元二次方程的解法4一元二次方程根的判别式授课课件（新版）华东师大版.ppt

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华师版九年级数学上册,也就是说，只有当一元二次方程ax2bxc0（a0）的系数a、b、c满足条件b24ac0时才有实数根.因此，我们可以根据一元二次方程的系数直接判定根的情况.,

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