21 加法 13 等于多少？
21 + 13 = 34
21加法13 等于 34
竖式演算
验算
- 用减法验算：34 − 13 = 21
- 用减法验算：34 − 21 = 13
相关题目
21 + 12 = 33
21 + 14 = 35
21 + 11 = 32
21 + 15 = 36
21 + 10 = 31
21 + 16 = 37
21 + 17 = 38
21 + 9 = 30
20 + 13 = 33
22 + 13 = 35
19 + 13 = 32
23 + 13 = 36
24 + 13 = 37
18 + 13 = 31
25 + 13 = 38
17 + 13 = 30
1 + 33 = 34
2 + 32 = 34
3 + 31 = 34
4 + 30 = 34
5 + 29 = 34
6 + 28 = 34
59 + 20 = 79
3 + 24 = 27
12 + 14 = 26
35 + 50 = 85
21 + 52 = 73
73 + 11 = 84
17 × 2 = 34
50 - 16 = 34