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What is the number of integers that are common to both set S and set T?
(1)The number of integers in S is 7, and the number of integers in T is 6.
(2)U is the set of integers that are in S only or in T only or in both, and the number of integers in U is 10.
分析A选项
分析B选项
分析C选项
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S单独的为a, T单独的为b，公共的为c，求c
（1）a+c=7 b+c=6
（2）a+b+c=10
综合（1）(2)求到c
小良冠二郎
条件2的意思就是并集，读懂了就很好做了。
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2023-05-09 15:44:50
lgw306976
这题不严谨啊！！！！又没有说U包含了所有S里边独有的！！！！只说包含了S里边独有的，那要是S里边12345，T里边45678，U里边只包含了345,567，这也不能这么算啊
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2023-04-22 09:49:30
RusselZ
想请问下set里面的数字可以重复吗
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2021-08-05 19:30:29
RusselZ回复RusselZ
无语子，原来不可以重复
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2021-08-05 19:32:41
啊啊我想读书回复 RusselZ
当然不行呀，集合里的元素具有互异性，即同一个集合中的元素是互不相同的。
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2022-10-29 20:37:21
392368ujjh
（2）的意思就是并集，读懂之后就很好做了。
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2020-09-19 17:22:53
ZiraoLi
有大神解答一下嘛？U有10个数，结合条件一排出6、7，还剩8个？？？
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2020-07-15 19:27:38
Rita慧回复ZiraoLi
条件一：T有6个数，S有7个数，条件二说S和T并集有10个数，所以交集=6+7-10=3=题目所问
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2020-09-01 14:05:19
195842kzu
所以这个u就是所有可选的数吗...没读懂
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2019-12-09 10:48:02
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