13 加法 21 等于多少？
13 + 21 = 34
13加法21 等于 34
竖式演算
验算
- 用减法验算：34 − 21 = 13
- 用减法验算：34 − 13 = 21
相关题目
13 + 20 = 33
13 + 22 = 35
13 + 19 = 32
13 + 23 = 36
13 + 24 = 37
13 + 18 = 31
13 + 25 = 38
13 + 17 = 30
12 + 21 = 33
14 + 21 = 35
11 + 21 = 32
15 + 21 = 36
10 + 21 = 31
16 + 21 = 37
17 + 21 = 38
9 + 21 = 30
1 + 33 = 34
2 + 32 = 34
3 + 31 = 34
4 + 30 = 34
5 + 29 = 34
6 + 28 = 34
53 + 5 = 58
2 + 82 = 84
60 + 28 = 88
25 + 43 = 68
41 + 35 = 76
73 + 23 = 96
91 - 57 = 34
65 - 31 = 34