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{1,2,3}∪{4,5,6} {5,5,6,6,7,7,8,8,9,9} {5,6,7,8,9} {5,7,9}
={1,2,3,5}, ={2,4,6},则图中的阴影部分表示的集合为( ) A.{2}B.{4,6} {1,3,5} {2,4,6}
={4,5}, ={3,4},则∁U.(A.∪B)=( ) A.{3,4,5}B.{1,2,3,4,6} {1,2,6} {1,2,3,5,6}
M.∪N. M.∩N. (∁I.M.)∪(∁I.N.) (∁I.M.)∩(∁I.N.)
{3,4,5,6,7,8} {5,8} {3,5,7,8} {4,5,6,8}
若n为偶数,则集合M.的个数为2个 若n为偶数,则集合M.的个数为2-1个 若n为奇数,则集合M.的个数为2个 若n为奇数,则集合M.的个数为2个
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*)
={2,0,1,6}, ={2,0,1,7}, ={2,0,1,5},则∁U.((A.∩C.)∪B.)=( ) A.{2,0,1,7}B.{0,6,7,8}C.{2,3,4,5} {3,4,5,6}
{3,4,5,6,7,8} {5,8} {3,5,7,8} {4,5,6,8}
={1,2,3,5}, ={2,4,6},则图中的阴影部分表示的集合为( ) A.{2}B.{4,6} {1,3,5} {4,6,7,8}
={1,2,4,6,8}, ={1,2,3,5,6,7} ,则AB的子集个数为( ) A.3 B.6 8 16
{3,4,5,6,7,8} {5,8}
{3,5,7,8} {4,5,6,8}