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标题: 帮忙看一下这道MATH JJ [打印本页]

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作者: yxydsy2007    时间: 2008-1-29 22:59
标题: 帮忙看一下这道MATH JJ

忙帮忙看一下

58.   100 students take A, B, C courses. Student take A+B+C=80, while 10 take AB, 18 take AC, 12 take BC, and 9 take ABC, how many students do not take any courses at all?

不用了，知道怎么算了

[此贴子已经被作者于2008-1-30 1:31:53编辑过]

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