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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3公式法授课课件（新版）华东师大版.ppt

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华师版九年级数学上册,解析：前面具体数字系数已做了很多，我们现在不妨把a、b、c也当成一个具体字母，根据上面的解题步骤就可以一直推下去.,由上可知，一元二次方程ax2bxc0（a0）的根由方程的系数a、b、c而定,

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