已知集合,,则
A. B.
C. D.
已知N为自然数集,集合P={1,4,7,10,13},Q={2,4,6,8,10},则P∩等于( )
A.{1,7,13} B.{4,10} C.{1,7} D.{0,1,3}
已知I={0,1,2,3,4,5,6,7,8},M={1,2,4,5},N={0,3,5,7},则=( )
A.{6,8} B.{5,7}
C.{4,6,7} D.{1,3,5,6,8}
设集合U={1,2,3,4,5,6,7},M={1,2,4,7},则 =( )
A.U B.{1,3,5}
C.{3,5,6} D.{2,4,6}
有如下结论:①m∈(P∪Q)⇒m∈P;②m∈(P∩Q)⇒m∈(P∪Q);③P⊆Q⇒P∪Q=Q;④P∪Q=P⇒P∩Q=Q.其中正确的个数是( )
A.1个 B.2个 C.3个 D.4个
集合M={1,3,a},N={2,a2}.若M∪N={1,2,3,4,16},则a的值为( )
A.0 B.1 C.2 D.4