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已知集合A={x|x≤1},B={x|x≥a},且A∪B=R,则实数a的取值范围...
已知集合A={x|x≤1},B={x|x≥a},且A∪B=R,则实数a的取值范围是 .
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1<x
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B.至少有一个小于
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C.都小于
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D.可能都大于
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若
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,
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,则m,n,p的大小关系为( )
A.m=p>n
B.m=p<n
C.m>p>n
D.m>n>p
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a是一个常数,函数
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的值域不可能是( )
A.{1}
B.
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C.
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D.
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已知四边形ABCD,AC是BD的垂直平分线,垂足为E,O为直线BD外一点.设向量
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,
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,则
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的值是( )
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A.8
B.16
C.-8
D.-16
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