以下是引用无比在2006-8-7 20:56:00的发言:Tom is going to move, he has three kinds of boxes: large, medium, and small. Now he has already 11 large boxes, each of which is either empty or filled with 6 medium boxes. Medium boxes are filled in the large boxes and each of them is either empty or filled with 6 small boxes. Small boxes are empty and filled in the medium boxes. How many boxes does Tom have? (1) he has 56 empty boxes (2) he has 42 small boxes
概率题。。。完全没有思路。。。。。。 以下是引用无比在2006-8-7 20:56:00的发言:Tom is going to move, he has three kinds of boxes: large, medium, and small. Now he has already 11 large boxes, each of which is either empty or filled with 6 medium boxes. Medium boxes are filled in the large boxes and each of them is either empty or filled with 6 small boxes. Small boxes are empty and filled in the medium boxes. How many boxes does Tom have? (1) he has 56 empty boxes (2) he has 42 small boxes
概率题。。。完全没有思路。。。。。。 条件一:El+Em+Es=56. (11-El)*6 = medium boxes (medium - Em) *6 = Es (66-6El-Em)*6 = 56 - El - Em 340 = 35El+5Em El =1 2 3 4 5 6 7 8 9 10 11 Em = 61 54 47 40 33 26 19 12 5 X X Es = X JX 6 12 18 24 30 36 42 X X 分析, el = 3 时 m = 48,空47个,剩6个给小空成立 S总 = 11+48+6 el = 4时 m =42,空 40个 剩12给小空成立。 S总 = 11 + 42 + 12 el = 9时,m = 12 ,空5个,剩42个给小成立 S总 = 11 + 12 + 42 条件1成立 条件二:small = 42 ,推出 MediumBox-Em = 7,无法继续推出。。。 总结: 这题真变态。。。。 |