13．设集合
={1,2}, ={2,3}, 
={2,3,4},则(∩)∪ = ．
14．函数y = log0.5(2 - x2)的值域是_____________________________
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13．设集合 ={1,2}, ={2,3}, ={2,3,4},则(∩)∪ = ．
14．函数y = log0.5(2 - x2)的值域是_____________________________
