21 加法 15 等于多少？
21 + 15 = 36
21加法15 等于 36
竖式演算
验算
- 用减法验算：36 − 15 = 21
- 用减法验算：36 − 21 = 15
相关题目
21 + 14 = 35
21 + 16 = 37
21 + 13 = 34
21 + 17 = 38
21 + 12 = 33
21 + 18 = 39
21 + 11 = 32
21 + 19 = 40
20 + 15 = 35
22 + 15 = 37
19 + 15 = 34
23 + 15 = 38
24 + 15 = 39
18 + 15 = 33
25 + 15 = 40
17 + 15 = 32
1 + 35 = 36
2 + 34 = 36
3 + 33 = 36
4 + 32 = 36
5 + 31 = 36
6 + 30 = 36
60 + 34 = 94
9 + 30 = 39
61 + 20 = 81
13 + 54 = 67
1 + 2 = 3
70 + 12 = 82
71 - 35 = 36
97 - 61 = 36