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2018年秋九年级数学上册第二十二章二次函数22.2二次函数与一元二次方程随堂检测（新版）新人教版.doc

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122.2 二次函 数与一元二次方程1.根据下列表格的对应值:x 3.23 3.24 3.25 3.26y=ax2+bx+c -0.06 -0.02 0.03 0.09判断方程 ax2+bx+c =0 (a 0,a,b,c为常数)一个解 x的范围是（ ）A. 30 ？（3） x取什么值时， y4;（3）2 x4.

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