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标题: 求助 og12 ds 50 [打印本页]

作者: samuelxie 时间: 2011-6-21 07:10 标题: 求助 og12 ds 50

how many people are directors of both company k and comany r?

(1) there were 17 directors pesent at a joint meeting of the directors of company k and company r , and no directors were absent

(2) company k has 12 directors and company r has 8 directors

这题我估计是我的翻译有问题，看不懂为什么选c，请讲解一下

作者: handapink 时间: 2011-6-21 20:04

条件1说明K并R有17人。
条件2说明集合K有12人，R有8人。
现求K交R有多少人。。。。
画下图显然是C

作者: samuelxie 时间: 2011-6-22 06:33

i got it，thx！

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