39 加法 31 等于多少？
39 + 31 = 70
39加法31 等于 70
竖式演算
验算
- 用减法验算：70 − 31 = 39
- 用减法验算：70 − 39 = 31
相关题目
39 + 30 = 69
39 + 32 = 71
39 + 29 = 68
39 + 33 = 72
39 + 28 = 67
39 + 34 = 73
39 + 35 = 74
39 + 27 = 66
38 + 31 = 69
40 + 31 = 71
37 + 31 = 68
41 + 31 = 72
42 + 31 = 73
36 + 31 = 67
43 + 31 = 74
35 + 31 = 66
1 + 69 = 70
2 + 68 = 70
3 + 67 = 70
4 + 66 = 70
5 + 65 = 70
6 + 64 = 70
45 + 47 = 92
17 + 25 = 42
9 + 59 = 68
90 + 68 = 158
81 + 30 = 111
70 + 30 = 100
80 - 10 = 70
35 × 2 = 70