10 加法 21 等于多少？
10 + 21 = 31
10加法21 等于 31
竖式演算
验算
- 用减法验算：31 − 21 = 10
- 用减法验算：31 − 10 = 21
相关题目
10 + 20 = 30
10 + 22 = 32
10 + 19 = 29
10 + 23 = 33
10 + 24 = 34
10 + 18 = 28
10 + 25 = 35
10 + 17 = 27
11 + 21 = 32
9 + 21 = 30
12 + 21 = 33
8 + 21 = 29
13 + 21 = 34
7 + 21 = 28
14 + 21 = 35
6 + 21 = 27
1 + 30 = 31
2 + 29 = 31
3 + 28 = 31
4 + 27 = 31
5 + 26 = 31
6 + 25 = 31
26 + 13 = 39
15 + 21 = 36
4 + 54 = 58
19 + 60 = 79
67 + 20 = 87
21 + 58 = 79
79 - 48 = 31
59 - 28 = 31