20 加法 9 等于多少？
20 + 9 = 29
20加法9 等于 29
竖式演算
验算
- 用减法验算：29 − 9 = 20
- 用减法验算：29 − 20 = 9
相关题目
20 + 8 = 28
20 + 10 = 30
20 + 11 = 31
20 + 7 = 27
20 + 12 = 32
20 + 6 = 26
20 + 13 = 33
20 + 5 = 25
19 + 9 = 28
21 + 9 = 30
22 + 9 = 31
18 + 9 = 27
23 + 9 = 32
17 + 9 = 26
24 + 9 = 33
16 + 9 = 25
1 + 28 = 29
2 + 27 = 29
3 + 26 = 29
4 + 25 = 29
5 + 24 = 29
6 + 23 = 29
73 + 12 = 85
25 + 40 = 65
84 + 5 = 89
3 + 83 = 86
30 + 23 = 53
22 + 67 = 89
78 - 49 = 29
30 - 1 = 29