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已知集合A={x|y=lg(a-x)},B={x|2<2x<4},且A∪(CRB...
已知集合A={x|y=lg(a-x)},B={x|2<2x<4},且A∪(CRB)=R,则实数a的取值范围是 .
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n.
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<
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