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函数f(x)=loga(6-ax)在[0,2]上为减函数,则a的取值范围是( )...
函数f(x)=loga(6-ax)在[0,2]上为减函数,则a的取值范围是( )
A.(0,1)
B.(1,3)
C.(1,3]
D.[3,+∞)
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、β都是锐角,则cosβ=( )
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B.
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C.
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D.
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在点(4,e
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B.4e
2C.2e
2D.e
2
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设tanθ和tan(
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2+px+q=0的两个根,则p、q之间的关系是( )
A.p+q+1=0
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下列函数中,既是偶函数,又是在区间(0,+∞)上单调递减的函数是( )
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A.a<b<c
B.a<c<b
C.c<a<b
D.b<c<a
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