口算练习 21
| 1 | 2 | 3 |
| 0+0=
| 0+1=
| 1+1=
| 1+2=
| 2+2=
| 2+3=
| 0+2=
| 2+1=
| 1+3=
| 1+4=
| 3+3=
| 3+4=
| 3+5=
| 1 | 2 | 3 |
| 0+0=
0
| 0+9=9
| 0+0+9=9
|| 0+1=
1
| 1+7=8
| 0+1+7=8
|| 1+1=
2
| 2+5=7
| 1+1+5=7
|| 1+2=
3
| 3+4=7
| 1+2+4=7
|| 2+2=
4
| 4+4=8
| 2+2+4=8
|| 2+3=
5
| 5+4=9
| 2+3+4=9
|| 0+2=
2
| 2+7=9
| 0+2+7=9
|| 2+1=
3
| 3+3=6
| 2+1+3=6
|| 1+3=
4
| 4+2=6
| 1+3+2=6
|| 1+4=
5
| 5+1=6
| 1+4+1=6
|| 3+3=
6
| 6+3=9
| 3+3+3=9
|| 3+4=
7
| 7+0=7
| 3+4+0=7
|| 3+5=
8
| 8+1=9
| 3+5+1=9
|
答案:
| 1 | 2 | 3 |
| 0 | 9 | 9 |
| 1 | 8 | 8 |
| 2 | 7 | 7 |
| 3 | 7 | 7 |
| 4 | 8 | 8 |
| 5 | 9 | 9 |
| 2 | 9 | 9 |
| 3 | 6 | 6 |
| 4 | 6 | 6 |
| 5 | 6 | 6 |
| 6 | 9 | 9 |
| 7 | 7 | 7 |
| 8 | 9 | 9 |
| 0 | 9 | 9 |
| 1 | 8 | 8 |
| 2 | 7 | 7 |
| 3 | 7 | 7 |
| 4 | 8 | 8 |
| 5 | 9 | 9 |
| 2 | 9 | 9 |
| 3 | 6 | 6 |
| 4 | 6 | 6 |
| 5 | 6 | 6 |
| 6 | 9 | 9 |
| 7 | 7 | 7 |
| 8 | 9 | 9 |
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