下面算式中,□内的数字之和分别为多少?
(1)
| |
|
□ |
□ |
| + |
|
□ |
□ |
| |
1 |
4 |
9 |
(2)
| |
□ |
□ |
□ |
| + |
□ |
□ |
□ |
| 1 |
9 |
9 |
2 |
(3)
| |
□ |
□ |
□ |
| + |
□ |
□ |
□ |
| 1 |
0 |
9 |
9 |
(4)
| |
□ |
□ |
□ |
| |
□ |
□ |
□ |
| + |
□ |
□ |
□ |
| 2 |
9 |
9 |
1 |