函数f(x)=
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的定义域是
.
考点分析:
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函数
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的定义域是:( )
A.[1,+∞)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077245013/SYS201311031017290772450011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077245013/SYS201311031017290772450011_ST/2.png)
D.
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若 f(x)=-x
2+2ax 与g(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077245013/SYS201311031017290772450010_ST/0.png)
在区间[1,2]上都是减函数,则a的取值范围是( )
A.(-1,0)∪(0,1)
B.(-1,0)∪(0,1]
C.(0,1]
D.(0,1)
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f(x)是定义在R上的奇函数,且单调递减,若f(2-a)+f(4-a)<0,则a的取值范围是( )
A.a<1
B.a<3
C.a>1
D.a>3
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函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077245013/SYS201311031017290772450008_ST/0.png)
的值域是( )
A.R
B.[0,2]
C.[-1,2)
D.[-1,2]
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下列函数中,是偶函数且在区间(0,+∞)上单调递减的函数是( )
A.y=-3
|x|B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101729077245013/SYS201311031017290772450007_ST/0.png)
C.y=log
3x
2D.y=x-x
2
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