49 加法 31 等于多少？
49 + 31 = 80
49加法31 等于 80
竖式演算
验算
- 用减法验算：80 − 31 = 49
- 用减法验算：80 − 49 = 31
相关题目
49 + 30 = 79
49 + 32 = 81
49 + 29 = 78
49 + 33 = 82
49 + 28 = 77
49 + 34 = 83
49 + 35 = 84
49 + 27 = 76
48 + 31 = 79
50 + 31 = 81
47 + 31 = 78
51 + 31 = 82
46 + 31 = 77
52 + 31 = 83
53 + 31 = 84
45 + 31 = 76
1 + 79 = 80
2 + 78 = 80
3 + 77 = 80
4 + 76 = 80
5 + 75 = 80
6 + 74 = 80
28 + 37 = 65
23 + 94 = 117
91 + 98 = 189
37 + 81 = 118
12 + 79 = 91
45 + 27 = 72
97 - 17 = 80
95 - 15 = 80