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有下列函数:①;②;③,其中最小值为2的函数有( ) A.3个 B.2个 C.1...
有下列函数:①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225013965990090/SYS201311012250139659900015_ST/0.png)
;②
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225013965990090/SYS201311012250139659900015_ST/1.png)
;③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225013965990090/SYS201311012250139659900015_ST/2.png)
,其中最小值为2的函数有( )
A.3个
B.2个
C.1个
D.0个
考点分析:
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