31 加法 18 等于多少？
31 + 18 = 49
31加法18 等于 49
竖式演算
验算
- 用减法验算：49 − 18 = 31
- 用减法验算：49 − 31 = 18
相关题目
31 + 17 = 48
31 + 19 = 50
31 + 20 = 51
31 + 16 = 47
31 + 21 = 52
31 + 15 = 46
31 + 22 = 53
31 + 14 = 45
30 + 18 = 48
32 + 18 = 50
29 + 18 = 47
33 + 18 = 51
28 + 18 = 46
34 + 18 = 52
35 + 18 = 53
27 + 18 = 45
1 + 48 = 49
2 + 47 = 49
3 + 46 = 49
4 + 45 = 49
5 + 44 = 49
6 + 43 = 49
37 + 62 = 99
2 + 44 = 46
7 + 2 = 9
2 + 90 = 92
10 + 46 = 56
54 + 43 = 97
7 × 7 = 49
57 - 8 = 49