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设函数f(x)=Asin(ωx+φ)(A≠0,ω>0,)的图象关于直线对称,它的...
设函数f(x)=Asin(ωx+φ)(A≠0,ω>0,)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861009_ST/0.png)
的图象关于直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861009_ST/1.png)
对称,它的周期是π,则( )
A.f(x)的图象过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861009_ST/2.png)
B.f(x)在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861009_ST/3.png)
上是减函数
C.f(x)的一个对称中心是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861009_ST/4.png)
D.f(x)的最大值是A
考点分析:
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今有一组数据,如下表:
X | 1.993 | 3.002 | 4.001 | 5.032 | 6.121 |
Y | 1.501 | 4.413 | 7.498 | 12.04 | 17.93 |
现准备从以下函数中选择一个近似的表示这组数据满足的规律,其中拟合最好的是( )
A.y=-2x-2
B.y=
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C.y=2
x-1+1
D.y=
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已知f(x)=2x
2-2
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已知f(x)是奇函数且对任意正实数x
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<0,则一定正确的是( )
A.f(x)在R上是减函数
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C.f(3)>f(-3)
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已知f(x) 为奇函数,当x>0 时,f(x)=lg(x+1),则当x<0时,f(x) 的表达式为( )
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设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/2.png)
是任意的三个非零平面向量,且他们相互不共线,给出下列命题
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/3.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/4.png)
;
②|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/5.png)
|-|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/6.png)
|<|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/7.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/8.png)
|;
③(3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/9.png)
+2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/10.png)
)•(3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/11.png)
-2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/12.png)
)=9
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/13.png)
-4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/14.png)
;
④
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/15.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/16.png)
不与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224849119386123/SYS201311012248491193861004_ST/17.png)
垂直.
其中正确的有( )
A.①②
B.②③
C.③④
D.②④
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