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已知f(x)是偶函数,且f(2+x)=f(2-x),当-2≤x≤0时,f(x)=...
已知f(x)是偶函数,且f(2+x)=f(2-x),当-2≤x≤0时,f(x)=2x,若n∈N*,an=f(n),则a2009= .
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下列说法:
①“∃x∈R,使2
x>3”的否定是“∀x∈R,使2
x≤3”;
②函数y=sin(2x+
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)sin(
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-2x)的最小正周期是π,
③命题“函数f(x)在x=x
处有极值,则f′(x
)=0”的否命题是真命题;
④f(x)是(-∞,0)∪(0,+∞)上的奇函数,x>0时的解析式是f(x)=2
x,则x<0时的解析式为f(x)=-2
-x其中正确的说法是
.
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已知sinα-cosα=
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,且α∈(0,π),则
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的值为
.
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已知函数
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的取值范围是
(用区间的形式表示).
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230349081519299/SYS201311012303490815192010_ST/0.png)
,且A、B、C三点共线,则k=
.
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已知函数y=xf′(x)的图象如图所示(其中f′(x)是函数f(x)的导函数),下面四个图象中y=f(x)的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230349081519299/SYS201311012303490815192009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230349081519299/SYS201311012303490815192009_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230349081519299/SYS201311012303490815192009_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230349081519299/SYS201311012303490815192009_ST/images3.png)
D.
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