问题
选择题
已知全集U={4,5,6,8,9}，M={5,6,8}，则集合CUM＝
A．{5,6,8}
B．{4,6,9}
C．{4,5,6,7,8,9}
D．{4,9}
答案
答案：D
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已知全集U={4,5,6,8,9}，M={5,6,8}，则集合CUM＝
A．{5,6,8}
B．{4,6,9}
C．{4,5,6,7,8,9}
D．{4,9}
答案：D