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函数y=|x-1|+|x-2|+…+|x-20|( )
A.图象无对称轴,且在R上不单调
B.图象无对称轴,且在R上单调递增
C.图象有对称轴,且在对称轴右侧不单调
D.图象有对称轴,且在对称轴右侧单调递增
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函数y=|lg(x-1)|的图象是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332003_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332003_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332003_ST/images2.png)
D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/images0.png)
如图,正方形ABCD的顶点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/1.png)
,顶点C,D位于第一象限,直线t:x=t(0≤t≤
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/2.png)
)将正方形ABCD分成两部分,记位于直线l左侧阴影部分的面积为f(t),则函数s=f(t)的图象大致是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/images4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/images5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850485433204/SYS201311030958504854332002_ST/images6.png)
D.
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已知f(1-x)=1+x,则f(x)的表达式为( )
A.f(x)=2-
B.f(x)=2+
C.f(x)=x-2
D.f(x)=x+1
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若空集是集合{x|x
2≤a,a∈R}的真子集,则实数a的取值范围是( )
A.(0,+∞)
B.[0,+∞)
C.(-∞,0)
D.(-∞,0]
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