已知向量
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与
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的夹角为30°,|
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|=
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,|
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|=4,则|2
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|=
.
考点分析:
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若θ∈(0,π),cos(π+θ)=
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,则sinθ=
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已知函数f(x)=
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,若a,b,c互不相等,且f(a)=f(b)=f(c),则a+b+c的取值范围是( )
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B.(1,2011)
C.(2,2011)
D.[2,2011]
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在约束条件
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下,当3≤S≤5时,Z=3x+2y的最大值的变化范围是( )
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设f(x)=
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过椭圆C:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222810864392262/SYS201311012228108643922006_ST/1.png)
B.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222810864392262/SYS201311012228108643922006_ST/3.png)
D.
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