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2018_2019学年九年级数学上册第21章一元二次方程教材回归（一）根的判别式的应用课件（新版）新人教版.ppt

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第二十一章 一元二次方程,教材回归(一) 根的判别式的应用,C,B,B,D,a1且a0,9,

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