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已知三角形△ABC的三边长成公差为2的等差数列,且最大角的正弦值为,则这个三角形...
已知三角形△ABC的三边长成公差为2的等差数列,且最大角的正弦值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102807465271703/SYS201311031028074652717006_ST/0.png)
,则这个三角形的周长是( )
A.18
B.21
C.24
D.15
考点分析:
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函数f(x)=Asin(ωx+φ)(其中
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)的图象如图所示,为了得到g(x)=sin2x的图象,则只需将f(x)的图象( )
A.向右平移
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个长度单位
B.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102807465271703/SYS201311031028074652717005_ST/2.png)
个长度单位
C.向左平移
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个长度单位
D.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102807465271703/SYS201311031028074652717005_ST/4.png)
个长度单位
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函数
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的零点个数为( )
A.2
B.3
C.4
D.5
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若
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,
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,则sinθ( )
A.{b
n}
B.S
nC.
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D.
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下列命题中正确的是( )
A.若命题p为真命题,命题q为假命题,则命题“p∧q”为真命题
B.命题“若xy=0,则x=0”的否命题为:“若xy=0,则x≠0”
C.“
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”是“
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”的充分不必要条件
D.命题“∀x∈R,2
x>0”的否定是“
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”
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已知集合A={1,2,3,4,5},B={(x,y)|x∈A,y∈A,x-y∈A},则B中所含元素的个数为( )
A.3
B.6
C.8
D.10
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