15 加法 6 等于多少？
15 + 6 = 21
15加法6 等于 21
竖式演算
验算
- 用减法验算：21 − 6 = 15
- 用减法验算：21 − 15 = 6
相关题目
15 + 5 = 20
15 + 7 = 22
15 + 4 = 19
15 + 8 = 23
15 + 3 = 18
15 + 9 = 24
15 + 2 = 17
15 + 10 = 25
14 + 6 = 20
16 + 6 = 22
13 + 6 = 19
17 + 6 = 23
12 + 6 = 18
18 + 6 = 24
11 + 6 = 17
19 + 6 = 25
1 + 20 = 21
2 + 19 = 21
3 + 18 = 21
4 + 17 = 21
5 + 16 = 21
6 + 15 = 21
49 + 17 = 66
9 + 3 = 12
16 + 8 = 24
88 + 2 = 90
76 + 83 = 159
36 + 7 = 43
76 - 55 = 21
70 - 49 = 21