题目

Get Your Degree at Home! Have you ever wondered what a degree might be worth to your job or career? It means a lot of Americans with an Associate Degree average nearly $ 10,000 more in their earnings than those with just a high school diploma. Harcourt Learning Direct offers you a way to get a Specialized Associate Degree in 11 of today’s growing fields---without having to go to college full time .With Harcourt, you study at home, in your spare time---so you don’t have to give up your present job while you train for a better one. Choose from exciting majors like Business management,有七名学生参加运动会．他们身上的T恤上分别标记有号码1、2、3、…或7．比赛最终获得第一名的学生完成比赛用时1分钟；最终获得第二名的学生完成比赛用时2分钟；最终获得第三名的学生完成比赛用时3分钟；依此类推．并且（1）将每位学生穿着的T恤上的号码与所费的时间相加，我们发现：（1）所得的和最大是13（恰只有一位学生）；（2）所得的和最小是4（恰只有一位学生）；（3）恰好有三位学生所得的和等于9．（2）第一名的学生所穿的T恤上的数大于第二名的学生所穿的T恤上的数．那么得到第一～七名的学生的T恤上的号码分别是 ．（要求按顺序写）