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幂函数y=f(x)的图象经过点(-2,-8),则满足f(x)=27的x的值是 ....
幂函数y=f(x)的图象经过点(-2,-8),则满足f(x)=27的x的值是 .
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奇函数f(x)在区间[3,7]上是增函数,在区间[3,6]上的最大值为8,最小值为-1,则2f(-6)+f(-3)=
.
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下列结论正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049011_ST/0.png)
B.函数y=x
2-4x-3在(2,+∞)上是减函数
C.函数
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在R上是减函数
D.函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049011_ST/2.png)
是奇函数
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049010_ST/0.png)
是(-∞,+∞)上的减函数,那么a的取值范围是( )
A.(0,1)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049010_ST/2.png)
D.
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函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049009_ST/0.png)
的零点个数为( )
A.3
B.2
C.1
D.0
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函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049008_ST/0.png)
的图象的大致形状是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049008_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049008_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230844038904944/SYS201311012308440389049008_ST/images3.png)
D.
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