摘要：8．设全集U＝A∪B＝{x∈N+|lg x＜1}.若A∩(∁UB)＝{m|m＝2n+1.n＝0,1,2,3,4}.则集合B＝ . [解析] A∪B＝{x∈N+|lg x＜1}＝{1,2,3,4,5,6,7,8,9}.A∩(∁UB)＝{m|m＝2n+1.n＝0,1,2,3,4}＝{1,3,5,7,9}. ∴B＝{2,4,6,8}． [答案] {2,4,6,8}

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