已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则(_uA)∪(_uB)=          .

已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则=___     _

已知集合U={1,2,3,4,5,6},对于集合AU，定义为A中所有元素之和，则全体的总和S=      

已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则(_uA)∪(_uB)=

(A){1,6}        (B){4,5}         (C){1,2,3,4,5,7}              (D){1,2,3,6,7}

已知集合U={1,2,3,4,5,6,7,8},M={1,3,5,7},N={5,6,7},则右图中的阴影部分表示的集合是(   )

A.{5,7}        B.{2,4} 

C.{2,4,8}      D.{1,3,5,6,7}