1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9
2-3 2-4 2-5 2-6 2-7 2-8 2-9
3-4 3-5 3-6 3-7 3-8 3-9
4-5 4-6 4-7 4-8 4-9
5-6 5-7 5-8 5-9
6-7 6-8 6-9
7-8 7-9
8-9
（8+1）*8/2=36（场）
如果六二班现在又9名同学进行羽毛球比赛如果两名同学之间进行一场比赛,一共要比36场.