设x是,且x∈(k,k+1)(k∈Z),则k= .
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若函数f(x)=log
a(2x
2+x)(a>0,a≠1)在区间(0,
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)内恒有f(x)>0,则f(x)的单调递增区间是( )
A.(-∞,-
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)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977005_ST/3.png)
D.(0,+∞)
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已知f(x)=log
a[(3-a)x-a]是其定义域上的增函数,那么a的取值范围是( )
A.(0,1)
B.(1,3)
C.(0,1)∪(1,3)
D.(3,+∞)
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已知函数f(x)=log
a(2
x+b-1)(a>0,a≠1)的图象如图所示,则a,b满足的关系是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977003_ST/images0.png)
A.0<a
-1<b<1
B.0<b<a
-1<1
C.0<b
-1<a<1
D.0<a
-1<b
-1<1
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已知0<a<1,x=log
a![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977002_ST/0.png)
+log
a![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977002_ST/1.png)
,y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977002_ST/2.png)
log
a5,z=log
a![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977002_ST/3.png)
-log
a![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211858267897746/SYS201310232118582678977002_ST/4.png)
,则( )
A.x>y>z
B.z>y>
C.y>x>z
D.z>x>y
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