满足M∪N={a,b}的集合M,N共有( )A.7组B.8组C.9组D.10组
题型:单选题难度:简单来源:不详
答案
满足M∪N={a,b}的集合M,N有: M=?,N={a,b}; M={a},N={b};M={a},N={a,b}; M={b},N={a};M={b},N={a,b}; M={a,b},N=?;M={a,b},N={a};M={a,b},N={b};M={a,b},N={a,b}. 共有9组. 故选C. |
举一反三
设全集为实数集R,M={x|x≤1+,x∈R},N={1,2,3,4},则CRM∩N=( )A.{4} | B.{3,4} | C.{2,3,4} | D.{1,2,3,4} |
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