8 加法 31 等于多少？
8 + 31 = 39
8加法31 等于 39
竖式演算
验算
- 用减法验算：39 − 31 = 8
- 用减法验算：39 − 8 = 31
相关题目
8 + 30 = 38
8 + 32 = 40
8 + 29 = 37
8 + 33 = 41
8 + 28 = 36
8 + 34 = 42
8 + 35 = 43
8 + 27 = 35
7 + 31 = 38
9 + 31 = 40
6 + 31 = 37
10 + 31 = 41
11 + 31 = 42
5 + 31 = 36
12 + 31 = 43
4 + 31 = 35
1 + 38 = 39
2 + 37 = 39
3 + 36 = 39
4 + 35 = 39
5 + 34 = 39
6 + 33 = 39
21 + 28 = 49
2 + 40 = 42
35 + 40 = 75
74 + 20 = 94
1 + 30 = 31
97 - 58 = 39
99 - 60 = 39
1 × 39 = 39