已知二次函数y=ax2+bx+c(a≠0)的图象如图,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114262140198912/2118526451761152/STEM/67080ebdf1ab4efeb698394ba7340328.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114262140198912/2118526451761152/STEM/67080ebdf1ab4efeb698394ba7340328.png?resizew=151)
A.ac>0 |
B.当x>1时,y随x的增大而增大 |
C.2a+b=1 |
D.方程ax2+bx+c=0有一个根是x=3 |
更新时间:2016-12-05 18:02:19
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【知识点】 二次函数图象与各项系数符号解读
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