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已知二次函数f(x)=ax2+bx+c的导数为f′(x),f′(0)>0,对于任...
已知二次函数f(x)=ax
2+bx+c的导数为f′(x),f′(0)>0,对于任意实数x都有f(x)≥0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736009_ST/0.png)
的最小值为( )
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736009_ST/1.png)
C.2
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736009_ST/2.png)
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