279. 4個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. 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)) 答案e 有PORTION是不是应该选B?
279. 4個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. 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)) 答案e 有PORTION是不是应该选B?