已知全集u={x∈n+|-2〈x〈9},m={3,4,5},p={1,3,6},那么{2,7,8}是a.m∪pb.m∩pc.(cum)∪(cup)d.(cum)∩(cup)

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已知全集u={x∈n+|-2〈x〈9},m={3,4,5},p={1,3,6},那么{2,7,8}是a.m∪pb.m∩pc.(cum)∪(cup)d.(cum)∩(cup)
已知全集u={x∈n+|-2〈x〈9},m={3,4,5},p={1,3,6},那么{2,7,8}是
a.m∪p
b.m∩p
c.(cum)∪(cup)
d.(cum)∩(cup)

已知全集u={x∈n+|-2〈x〈9},m={3,4,5},p={1,3,6},那么{2,7,8}是a.m∪pb.m∩pc.(cum)∪(cup)d.(cum)∩(cup)
(CuM)=|-1,0,1,2,6,7,8| (CuP)=|-1,0,2,4,5,7,8|
(CuM)∩(CuP) =|-1,0,2,7,8|
|2,7,8|∈|-1,0,2,7,8|
即|2,7,8|∈(CuM)∩(CuP)
所以选(3)