30 加法 31 等于多少？
30 + 31 = 61
30加法31 等于 61
竖式演算
验算
- 用减法验算：61 − 31 = 30
- 用减法验算：61 − 30 = 31
相关题目
30 + 30 = 60
30 + 32 = 62
30 + 29 = 59
30 + 33 = 63
30 + 28 = 58
30 + 34 = 64
30 + 35 = 65
30 + 27 = 57
29 + 31 = 60
31 + 31 = 62
28 + 31 = 59
32 + 31 = 63
33 + 31 = 64
27 + 31 = 58
34 + 31 = 65
26 + 31 = 57
1 + 60 = 61
2 + 59 = 61
3 + 58 = 61
4 + 57 = 61
5 + 56 = 61
6 + 55 = 61
36 + 20 = 56
73 + 5 = 78
7 + 61 = 68
24 + 41 = 65
46 + 52 = 98
18 + 70 = 88
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74 - 13 = 61