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从集合{a、b、c}到集合中{1、2}可以建立不同的映射有 个.
从集合{a、b、c}到集合中{1、2}可以建立不同的映射有 个.
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已知A={x|-2≤x≤5},B={x|m+1≤x≤2m-1},B⊆A,则m的取值范围为( )
A.(-∞,3]
B.[1,3]
C.[2,3]
D.
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若
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,则实数a的取值范围是( )
A.
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B.
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C.
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D.R
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下列图形中,不可作为函数y=f(x)图象的是( )
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B.
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C.
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D.
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若偶函数f(x)在(-∞,-1)上是增函数,则下列关系式中成立的是( )
A.f(-
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)<f(-1)<f(-2)
B.f(-1)<f(-
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)<f(2)
C.f(2)<f(-1)<f(-
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)
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)<f(-1)
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已知函数f(x)=(m-1)x
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2-7m+12)为偶函数,则m的值是( )
A.1
B.2
C.3
D.4
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