问一道英文数学题目(美国高中水平的)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 b
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问一道英文数学题目(美国高中水平的)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 b
问一道英文数学题目(美国高中水平的)
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?
怎么我一直做都是负数呢?
问一道英文数学题目(美国高中水平的)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 b
这道题很奇怪啊.
条件1:For any two of the magazaines,4 people subscribed to both magazines but not to the thrid magazine,
说明,有三组四个人的同时订了两个杂志,这个时候投票名额就用了24票.
也就是说,12个人,24票.
条件2:If 5 people in the survey did not subscribe to any of three magazines
也就是说,5个人,0票.
这个时候总共63个人,减掉就只剩下46个人.
总共三组投票投了23+21+17=61票.
减掉就剩下37票.
最多一人投一个magazine,这时候还有9个人没有票投!
好random.难怪是负的.
楼主要求的,可能是用英语答这道题。所以特别将一楼提供的解法转成英语,如下: Let X denote the number of points scored by team x; and Y denote
5个人没订任何杂志,那么订杂志的总人数63-5=58
被订的杂志总数32+21+17=70
有四个人订了两份,那么这四个人订了4*2=8
那么剩下58-4=54个人总共订了70-8=62份
订三份杂志的人数设为x 则3x+54-x=62
解得x=4
要是读懂了,还是很简单的,中国高中要是出这种题估计老师都被骂死了···可是题目答案是9耶,我都怀疑...
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5个人没订任何杂志,那么订杂志的总人数63-5=58
被订的杂志总数32+21+17=70
有四个人订了两份,那么这四个人订了4*2=8
那么剩下58-4=54个人总共订了70-8=62份
订三份杂志的人数设为x 则3x+54-x=62
解得x=4
要是读懂了,还是很简单的,中国高中要是出这种题估计老师都被骂死了···
收起
23+21+17+5-4-2x=63
在调查的63人中,23人订阅杂志A,21人订阅杂志B,和17人订阅了杂志C,有4人订了其中任意两本杂志。如果在调查中有5人不订阅三种中任意一本杂志,有多少人订阅所有三种杂志?
你题目错了吧?
peqpie是人的意思,63people就是63个人的意思。为了不让你失望,我再提供一个;'howmanypeople'是多少人的意思,那么这道题的答案就不可能是负数了。我是三年级的小学生,有英语老师,明天你等着吧!
英文水平有限,不是63-5=78么?而不是不是的,答案是9对的 ,我也跟你想法一样了哈哈。 圈子内有58个人啊,3个圈子重叠人才61。可是有4个人是属于两个圈子的,但又不属于3个圈子。 负的啊?? 知道了 回我一下怎么搞得么。好像是题目给出错了。。。...
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英文水平有限,不是63-5=78么?
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