满足条件A∪{1,2}={1,2,3}的集合A有( )A.1个B.2个C.4个D.8个
题型:单选题难度:简单来源:不详
满足条件A∪{1,2}={1,2,3}的集合A有( ) |
答案
∵A∪{1,2}={1,2,3} ∴A={3},A={1,3},A={2,3},A={1,2,3} 故选C. |
举一反三
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