若f(x)=2x+2-xlga是奇函数,则实数a= .
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若α是第三象限角,且tan(α-π)=2,则
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=
.
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设函数
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,则函数y=f(x)( )
A.在区间(0,1),(1,2)内均有零点
B.在区间(0,1)内有零点,在区间(1,2)内无零点
C.在区间(0,1),(1,2)内均无零点
D.在区间(0,1)内无零点,在区间(1,2)内有零点
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349006_ST/images0.png)
设函数f(x)在定义域内可导,y=f(x)的图象如图所示,则导函数y=f′(x)可能( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349006_ST/images3.png)
D.
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在△ABC中,“
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•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349005_ST/1.png)
=
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•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349005_ST/3.png)
”是“|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349005_ST/4.png)
|=|
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|”( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
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下列函数中,图象的一部分如图所示的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102633153834914/SYS201311031026331538349004_ST/2.png)
D.
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