JJ 95题不懂

myfield · 发表于 2011-7-9 11:08:45

Four extra-large sandwiches of exactly the same size were ordered formstudents, wherem> 4.Three of the sandwiches were evenly divided among the students. Since 4 students did not want any of the fourth sandwich, it was evenly divided among the remaining students. If Carol ate one piece from each of the four sandwiches, the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?
A( m+4)/m(m-4)B (2m-4)/m(m-4)C (4m-4)/m(m-4)D(4m-8)/m(m-4)
E(4m-12)/m(m-4)
虽然答案是E最接近，但是我真心不懂为什么啊，假设每个三明治size是X，则前三个Carol一共分到3X/m，最后一个分到X/(m-4)，那比例应该是[3X/m+X/(m-4)]/4X，算出来答案是（m-3）/m(m-4)，求指点!

dyt0416 · 发表于 2011-7-9 11:19:06

楼主看错题目啦~
the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?

是跟一个比的哦~ 所以[3X/m+X/(m-4)]/X 不是/4x啦~　　
共勉～

dxt678 · 发表于 2011-7-9 11:20:20

Four extra-large sandwiches of exactly the same size were ordered formstudents, wherem> 4.Three of the sandwiches were evenly divided among the students. Since 4 students did not want any of the fourth sandwich, it was evenly divided among the remaining students. If Carol ate one piece from each of the four sandwiches, the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?
A( m+4)/m(m-4)B (2m-4)/m(m-4)C (4m-4)/m(m-4)D(4m-8)/m(m-4)
E(4m-12)/m(m-4)
虽然答案是E最接近，但是我真心不懂为什么啊，假设每个三明治size是X，则前三个Carol一共分到3X/m，最后一个分到X/(m-4)，那比例应该是[3X/m+X/(m-4)]/4X，算出来答案是（m-3）/m(m-4)，求指点!

-- by 会员 myfield (2011/7/9 11:08:45)

myfield · 发表于 2011-7-9 11:30:31

恩，对的，我光看个whole了

JJ 95题不懂

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