3. is the standard deviation of T(一数列) greater than S(一数列)
(1) mean of T is greater than that of S
(2) median of T is greater than that of S
如何思考？选多少？
4、定义max (x, y )= the larger one of x, y .and min (x, y )=the smaller one of the two numbers. for example max (5 2)=5,and min (5 2)=2. question : min (10 w )=？
1) w =max (20 z)for some z.
2) w= max(10 w).如何思考？选多少？
5、過橋一次要0.65圓 買月票13圓每次扣0.3圓
只少美隔幾天過橋兩次比較划算？
6、in a certain room, the width is 12, the length is 16, and the height is 10. there's a bulb in the central of ceiling, what's the largest distance between the bulb and the corner of the room.（距离本来就是固定的，而求最大直？）
7、X和Y的十位数都是6的倍数，问2X+2Y的十位数有几种可能值？
8、30人有3个组织A BC 它们的人数分别是8、5、12 A中没有1人在BC中问最多有多少人没有加入组织?
谢谢！
