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
30 + 52 = 82
90 + 7 = 97
2 + 84 = 86
100 + 79 = 179
21 + 70 = 91
48 + 1 = 49
41 - 7 = 34
37 - 3 = 34