| (1)274+156________274-156 | 8×9________8×9×2 |
| (2)543-210________643-210 | 459+136________459+163 |
| (3)142+127________227+42 | 350+150________350+0 |
| (4)348-256________348-156 | 81÷9________72÷8. |
6个点连成直线的条数是________,8个点连成直线的条数是________.
| 点数 | ||||
| 增加条数 | 2 | 3 | 4 | |
| 总条数 | 1 | 3 | 6 | 10 |
| (1)274+156________274-156 | 8×9________8×9×2 |
| (2)543-210________643-210 | 459+136________459+163 |
| (3)142+127________227+42 | 350+150________350+0 |
| (4)348-256________348-156 | 81÷9________72÷8. |
| 点数 | ||||
| 增加条数 | 2 | 3 | 4 | |
| 总条数 | 1 | 3 | 6 | 10 |