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  • 問一道英文數(shù)學題目(美國高中水平的)

    問一道英文數(shù)學題目(美國高中水平的)
    In a survey of 63 people,23 people subscribed to magazine A,21 people subscribed to magazine B,and 17 subscribed to magazine C.For any two of the magazaines,4 people subscribed to both magazines but not to the thrid magazine.If 5 people in the survey did not subscribe to any of three magazines,how many people subscribed to all three magazines?
    怎么我一直做都是負數(shù)呢?
    英語人氣:572 ℃時間:2020-02-06 09:29:20
    優(yōu)質解答
    這道題很奇怪啊.
    條件1:For any two of the magazaines,4 people subscribed to both magazines but not to the thrid magazine,
    說明,有三組四個人的同時訂了兩個雜志,這個時候投票名額就用了24票.
    也就是說,12個人,24票.
    條件2:If 5 people in the survey did not subscribe to any of three magazines
    也就是說,5個人,0票.
    這個時候總共63個人,減掉就只剩下46個人.
    總共三組投票投了23+21+17=61票.
    減掉就剩下37票.
    最多一人投一個magazine,這時候還有9個人沒有票投!
    好random.難怪是負的.
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