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={2,5,8}, ={1,3,5,7},则(∁U.A.)∩B等于( ) A.{5}B.{1,3,7} {2,8} {1,3,4,5,6,7,8}
={1,3,5,7}, ={2,4,5},则∁U.(A.∪B.)=( ) A.{6,8}B.{5,7} {4,6,7} {1,3,5,6,8}
7,5,3,1 1,5,7,3 1,3,5,7 7,1,3,5
{5,7} {2,4} {2,4,8} {1,3,5,6,7}
={1,3,5,7}, ={2,4,5}则∁U.(A.∪B.)=( ) A.{6,8} B.{5,7} {4,6,7} {1,3,5,6,8}
{1,3} {3,5} {1,3,5} {1,3,5,7}
{3,5} {5,7} {3,7} N={1,3,5,7}
{5,7} {2,4} {2,4,8} {1,3,5,6,7}
={1,3,5,7}, ={2,4,5}则∁U.(A.∪B.)( ) A.{6,8}B.{5,7} {4,6,7} {1,3,5,6,8}
={2,4,5}, ={1,3,5,7},则A.∩(∁U.B.)=( ) A.{5}B.{2,4} {2,4,5,6} {1,2,3,4,5,7}
数列2,3,5可表示为{2,3,5} 数列2,4,6,8与数列8,6,4,2是相同的数列 集合{1,3,5,7}与集合{7,5,3,1}是相同的集合 数列1,3,5,7,…可记为{2n+1}(n∈N*)
{1,2,3, 5} ф {0} {1,3,5,7, 11, 13, 17, 19}
{1,3,5} {1,3,5,7}
{1,3,4,5,7} {1,3,4,5,6,7}
={2,4,5},则∁U.A.=( ) A.∅ {1,3,5} {1,3,6,7} {1,3,5,7}
={1,3,5,7}, ={2,5},则∁U.(A.∪B)等于( ) A.{6,8}B.{5,7} {4,6,8} {1,3,5,6,8}