已知A={x|-2≤x≤5},B={x|m+1≤x≤2m-1},B⊆A,求m的取值范围.
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已知向量
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,则k=
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设a>1,函数f(x)=log
ax在区间[a,3a]上的最大值与最小值之差为
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,则a等于( )
A.
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B.3
C.3
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D.9
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