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函数f(x)=Asin(ωx+φ)(其中A>0,ω>0,)的图象如图所示,为了得...
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函数f(x)=Asin(ωx+φ)(其中A>0,ω>0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743341123/SYS201311031027297433411008_ST/0.png)
)的图象如图所示,为了得到y=cos2x的图象,则只要将f(x)的图象( )
A.向左平移
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个单位长度
B.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743341123/SYS201311031027297433411008_ST/2.png)
个单位长度
C.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743341123/SYS201311031027297433411008_ST/3.png)
个单位长度
D.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729743341123/SYS201311031027297433411008_ST/4.png)
个单位长度
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是R上的减函数,则a的取值范围是( )
A.(0,1)
B.
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C.
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D.
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在△ABC中,A,B,C的对边分别为a,b,c,若acosC,bcosB,ccosA成等差数列,则B=( )
A.
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B.
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C.
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D.
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已知函数y=f(x)在(0,1)内的一段图象是如图所示的一段圆弧,若0<x
1<x
2<1,则( )
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A.
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<
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B.
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=
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C.
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>
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D.不能确定
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已知各项为正的等比数列{a
n}中,a
4与a
14的等比中项为
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,则2a
7+a
11的最小值为( )
A.16
B.8
C.
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D.4
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如图,水平放置的三棱柱ABC-A
1B
1C
1中,侧棱AA
1⊥平面A
1B
1C
1,其正视图是边长为a的正方形.俯视图是边长为a的正三角形,则该三棱柱的侧视图的面积为( )
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A.a
2B.
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a
2C.
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a
2D.
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a
2
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