| 2 |
| x |
| 0 | 1 | 2 | 3 | |
| 0 | (0,0) | (0,1) | (0,2) | (0,3) |
| 1 | (1,0) | (1,1) | (1,2) | (1,3) |
| 2 | (2,0) | (2,1) | (2,2) | (2,3) |
| 2 |
| x |
| 2 |
| 12 |
| 1 |
| 6 |
| 0 | 1 | 2 | 3 | |
| 0 | (0,0) | (0,1) | (0,2) | (0,3) |
| 1 | (1,0) | (1,1) | (1,2) | (1,3) |
| 2 | (2,0) | (2,1) | (2,2) | (2,3) |
| 2 |
| x |
| 2 |
| 12 |
| 1 |
| 6 |
(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 |