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 |