幂函数f(x)=x
α过点(2,4),求出f(x)的解析式并用单调性定义证明f(x)在(0,+∞)上为增函数.
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设函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613012_ST/0.png)
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613011_ST/0.png)
的最大值为M,最小值为m,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613011_ST/1.png)
的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613011_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613011_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102504359761366/SYS201311031025043597613011_ST/4.png)
D.
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