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(2003•常德)二次函数y=ax2+bx+c的图象如图所示,则关于此二次函数的...
(2003•常德)二次函数y=ax
2+bx+c的图象如图所示,则关于此二次函数的下列四个结论①a<0;②c>0;③b
2-4ac>0;④
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232403697792667/SYS201310212324036977926021_ST/0.png)
<0中,正确的结论有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232403697792667/SYS201310212324036977926021_ST/images1.png)
A.一个
B.二个
C.三个
D.四个
考点分析:
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