21 加法 1 等于多少？
21 + 1 = 22
21加法1 等于 22
竖式演算
验算
- 用减法验算：22 − 1 = 21
- 用减法验算：22 − 21 = 1
相关题目
21 + 2 = 23
21 + 3 = 24
21 + 4 = 25
21 + 5 = 26
21 + 6 = 27
21 + 7 = 28
21 + 8 = 29
21 + 9 = 30
20 + 1 = 21
22 + 1 = 23
19 + 1 = 20
23 + 1 = 24
24 + 1 = 25
18 + 1 = 19
25 + 1 = 26
17 + 1 = 18
1 + 21 = 22
2 + 20 = 22
3 + 19 = 22
4 + 18 = 22
5 + 17 = 22
6 + 16 = 22
81 + 4 = 85
31 + 4 = 35
43 + 13 = 56
4 + 52 = 56
22 + 36 = 58
10 + 36 = 46
56 - 34 = 22
29 - 7 = 22