21 加法 12 等于多少？
21 + 12 = 33
21加法12 等于 33
竖式演算
验算
- 用减法验算：33 − 12 = 21
- 用减法验算：33 − 21 = 12
相关题目
21 + 11 = 32
21 + 13 = 34
21 + 10 = 31
21 + 14 = 35
21 + 15 = 36
21 + 9 = 30
21 + 16 = 37
21 + 8 = 29
20 + 12 = 32
22 + 12 = 34
19 + 12 = 31
23 + 12 = 35
24 + 12 = 36
18 + 12 = 30
25 + 12 = 37
17 + 12 = 29
1 + 32 = 33
2 + 31 = 33
3 + 30 = 33
4 + 29 = 33
5 + 28 = 33
6 + 27 = 33
80 + 10 = 90
8 + 61 = 69
40 + 50 = 90
41 + 28 = 69
90 + 7 = 97
41 + 5 = 46
94 - 61 = 33
56 - 23 = 33