31 加法 49 等于多少？
31 + 49 = 80
31加法49 等于 80
竖式演算
验算
- 用减法验算：80 − 49 = 31
- 用减法验算：80 − 31 = 49
相关题目
31 + 48 = 79
31 + 50 = 81
31 + 47 = 78
31 + 51 = 82
31 + 46 = 77
31 + 52 = 83
31 + 53 = 84
31 + 45 = 76
30 + 49 = 79
32 + 49 = 81
29 + 49 = 78
33 + 49 = 82
28 + 49 = 77
34 + 49 = 83
35 + 49 = 84
27 + 49 = 76
1 + 79 = 80
2 + 78 = 80
3 + 77 = 80
4 + 76 = 80
5 + 75 = 80
6 + 74 = 80
92 + 81 = 173
69 + 24 = 93
52 + 29 = 81
38 + 54 = 92
93 + 66 = 159
19 + 59 = 78
81 - 1 = 80
89 - 9 = 80