數學 集的問題
2008-09-24 8:12 am
若A={1.2.3.4.5.6},B={4.5.6.7.8}.C={2.4.6.8.},,D={3.5},E={5.6},F={4.6}:設X代表任一集,而X包含於A,X包含於B.X不包含於C,問D,E,F各集之中,何集相當於X?
回答 (1)
2008-09-24 8:21 am
✔ 最佳答案
x belongs to set A and set B.therefore, x belongs to the intersection of set A and B
x belongs to {4,5,6}
but x does not belong to set C
=>x belongs to the intersection of {4,5,6} and C'
x belongs to the set {5}
x=5
i.e. x belongs to set D, E ,but not F
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