共50条信息
\(18\).
已知集合\(A=\left\{ x\left| 1 < x < 3 \right. \right\}\),集合\(B=\left\{ x\left| 2m < x < 1-m \right. \right\}\).
\((1)\)当\(m=-1\)时,求\(A∪B \);
\((2)\)若\(A\subseteq B\),求实数\(m\)的取值范围;
\((3)\)若\(A∩B=\varnothing \),求实数\(m\)的取值范围.
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