21 加法 39 等于多少？
21 + 39 = 60
21加法39 等于 60
竖式演算
验算
- 用减法验算：60 − 39 = 21
- 用减法验算：60 − 21 = 39
相关题目
21 + 38 = 59
21 + 40 = 61
21 + 37 = 58
21 + 41 = 62
21 + 42 = 63
21 + 36 = 57
21 + 43 = 64
21 + 35 = 56
20 + 39 = 59
22 + 39 = 61
19 + 39 = 58
23 + 39 = 62
24 + 39 = 63
18 + 39 = 57
25 + 39 = 64
17 + 39 = 56
1 + 59 = 60
2 + 58 = 60
3 + 57 = 60
4 + 56 = 60
5 + 55 = 60
6 + 54 = 60
72 + 62 = 134
92 + 76 = 168
23 + 19 = 42
78 + 71 = 149
34 + 56 = 90
71 + 81 = 152
67 - 7 = 60
10 × 6 = 60