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
45 + 12 = 57
6 + 31 = 37
1 + 90 = 91
23 + 14 = 37
74 + 21 = 95
53 + 36 = 89
82 - 51 = 31
83 - 52 = 31