2 加法 31 等于多少？
2 + 31 = 33
2加法31 等于 33
竖式演算
验算
- 用减法验算：33 − 31 = 2
- 用减法验算：33 − 2 = 31
相关题目
2 + 30 = 32
2 + 32 = 34
2 + 29 = 31
2 + 33 = 35
2 + 28 = 30
2 + 34 = 36
2 + 35 = 37
2 + 27 = 29
1 + 31 = 32
3 + 31 = 34
4 + 31 = 35
5 + 31 = 36
6 + 31 = 37
7 + 31 = 38
8 + 31 = 39
9 + 31 = 40
1 + 32 = 33
3 + 30 = 33
4 + 29 = 33
5 + 28 = 33
6 + 27 = 33
7 + 26 = 33
12 + 50 = 62
100 + 7 = 107
20 + 78 = 98
60 + 100 = 160
30 + 50 = 80
30 + 17 = 47
42 - 9 = 33
37 - 4 = 33