27 加法 21 等于多少？
27 + 21 = 48
27加法21 等于 48
竖式演算
验算
- 用减法验算：48 − 21 = 27
- 用减法验算：48 − 27 = 21
相关题目
27 + 20 = 47
27 + 22 = 49
27 + 19 = 46
27 + 23 = 50
27 + 24 = 51
27 + 18 = 45
27 + 25 = 52
27 + 17 = 44
26 + 21 = 47
28 + 21 = 49
29 + 21 = 50
25 + 21 = 46
30 + 21 = 51
24 + 21 = 45
31 + 21 = 52
23 + 21 = 44
1 + 47 = 48
2 + 46 = 48
3 + 45 = 48
4 + 44 = 48
5 + 43 = 48
6 + 42 = 48
10 + 80 = 90
2 + 66 = 68
37 + 41 = 78
51 + 31 = 82
18 + 11 = 29
35 + 2 = 37
83 - 35 = 48
93 - 45 = 48