133) 4个same big sandwiches, divided to m students (M>4), first 3 divided to m, last one divided by (m-4), cause 4 of the students want none of sandwiches. C ate a piece of all 4, ask portion of C ate. 文字较长有点读不懂,花了5分钟
几点澄清:
文字比较搞,大约6-7行,看了三遍没看懂(水平太低),最后理解为,四种sandwiches,M个students,前三个分成M份,第四个分成(M-4)份,C吃了4份,每种一份。问吃了占总数的多少。题目不难。现在想想应该(M-3)/(M(M-4)), 既 (3/m+1/(M-4))/4
A) (m-4)/(m(m-4))
B) (4m-4)/(m(m-4))
C) (m-3)/(m(m-4))
D) (m-8)/(m(m-4))
E) (4m-12)/(m(m-4))
题目叙述一样,我问的是占一个的多少,不是占总数的多少,所以不用再除以4了,答案E.