18 加法 31 等于多少？
18 + 31 = 49
18加法31 等于 49
竖式演算
验算
- 用减法验算：49 − 31 = 18
- 用减法验算：49 − 18 = 31
相关题目
18 + 30 = 48
18 + 32 = 50
18 + 29 = 47
18 + 33 = 51
18 + 28 = 46
18 + 34 = 52
18 + 35 = 53
18 + 27 = 45
17 + 31 = 48
19 + 31 = 50
20 + 31 = 51
16 + 31 = 47
21 + 31 = 52
15 + 31 = 46
22 + 31 = 53
14 + 31 = 45
1 + 48 = 49
2 + 47 = 49
3 + 46 = 49
4 + 45 = 49
5 + 44 = 49
6 + 43 = 49
3 + 26 = 29
64 + 35 = 99
21 + 17 = 38
25 + 41 = 66
36 + 12 = 48
11 + 32 = 43
72 - 23 = 49
64 - 15 = 49