| 1 | 2 | 3 | 4 | 5 | |
| 6 | (1,6) | (2,6) | (3,6) | (4,6) | (5,6) |
| 7 | (1,7) | (2,7) | (3,7) | (4,7) | (5,7) |
| 8 | (1,8) | (2,8) | (3,8) | (4,8) | (5,8) |
| 9 | (1,9) | (2,9) | (3,9) | (4,9) | (5,9) |
| 10 | (1,10) | (2,10) | (3,10) | (4,10) | (5,10) |
| 11 | (1,11) | (2,11) | (3,11) | (4,11) | (5,11) |
| 14 |
| 30 |
| 7 |
| 15 |
(2013·临沂)如图,在平面直角坐标系中,点A1,A2在x轴上,点B1,B2在y轴上,其坐标分别为A1(1,0),A2(2,0),B1(0,1),B2(0,2),分别以A1、A2、B1、B2其中的任意两点与点O为顶点作三角形,所作三角形是等腰三角形的概率是( )
| 5 |
| 4 |