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设O(0,0),A(1,0),B(0,1),点p是线段AB上的一个动点,
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,若
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,则实数λ的取值范围是( )
A.
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B.
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C.
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D.
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已知函数f(x)=
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,若数列{a
n}满足a
n=f(n)(n∈N
﹡),且{a
n}是递增数列,则实数a的取值范围是( )
A.[
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,3)
B.(
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,3)
C.(2,3)
D.(1,3)
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如果函数y=2tan(2x+φ)的图象关于点(
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π,0)对称,则|φ|的最小值为( )
A.
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B.
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C.
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D.0
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设x,y满足约束条件
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,若目标函数z=-ax+by(a>0,b>0)的值是最大值为 8,则
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+
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的最小值为( )
A.
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B.2
C.
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D.4
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若互不相等的正数a,b,c成等差数列,a+1,b+1,c+5成等比数列,且a+2b+c=28,则a=( )
A.4
B.2
C.3
D.-4
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