39 加法 21 等于多少？
39 + 21 = 60
39加法21 等于 60
竖式演算
验算
- 用减法验算：60 − 21 = 39
- 用减法验算：60 − 39 = 21
相关题目
39 + 20 = 59
39 + 22 = 61
39 + 19 = 58
39 + 23 = 62
39 + 24 = 63
39 + 18 = 57
39 + 25 = 64
39 + 17 = 56
38 + 21 = 59
40 + 21 = 61
37 + 21 = 58
41 + 21 = 62
42 + 21 = 63
36 + 21 = 57
43 + 21 = 64
35 + 21 = 56
1 + 59 = 60
2 + 58 = 60
3 + 57 = 60
4 + 56 = 60
5 + 55 = 60
6 + 54 = 60
40 + 77 = 117
2 + 28 = 30
73 + 32 = 105
46 + 28 = 74
56 + 36 = 92
18 + 26 = 44
63 - 3 = 60
78 - 18 = 60