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题型：解答题 题类：期末考试 难易度：难
设\(f\left( x \right)\)是定义域为\(\left\{ \left. x \right|x\ne 0 \right\}\)的奇函数，满足在\(\left( -\infty ,0 \right)\)上有\(xf\left( 2x \right)\)单调递减，且\(f\left( -2 \right)=0\)，则不等式\(xf\left( 2x \right) < 0\)的解集为_______
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