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设全集为\(\text{R}\),集合\(A=\left \{ {x|2\leq x<4} \right \} \),集合\(B=\left \{ {x|x\leq 1-2m} \right \} \),若\(A\cap B=\varnothing \),则实数\(m\)的取值范围为___.
参考答案:\((-\infty ,-\frac {1} {2}]\)
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