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={1,2}, ={2,3},则( ) A.{4,5} B.{2,3} {1} {2}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
={1,3},则 A. {1,3} {2,4,5} {1,2,3,4,5}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
=(1,2,5},∁U. =(1,3,5},则A.∩B.=( ) A.{2}B.{5} {1,2,4,5} {3,4,5}
={x|x2-3x+2=0}, ={x|x=2a,a∈A.},则集合∁U.(A.∪B.)中元素的个数为( ) A.1B.2 3 4
{5} {1,2,5} {2,3,4} {1,2,3,4}
={1,2}, ={2,3},则( ) A.{4,5} B.{2,3} {1} {2}
{1,2,3} {1,3,5} {1,4,5} {2,3,4}
{1} {3,5} {1,2,4,6} {1,2,3,4,5}