6 加法 15 等于多少？
6 + 15 = 21
6加法15 等于 21
竖式演算
验算
- 用减法验算：21 − 15 = 6
- 用减法验算：21 − 6 = 15
相关题目
6 + 14 = 20
6 + 16 = 22
6 + 13 = 19
6 + 17 = 23
6 + 12 = 18
6 + 18 = 24
6 + 11 = 17
6 + 19 = 25
5 + 15 = 20
7 + 15 = 22
4 + 15 = 19
8 + 15 = 23
3 + 15 = 18
9 + 15 = 24
2 + 15 = 17
10 + 15 = 25
1 + 20 = 21
2 + 19 = 21
3 + 18 = 21
4 + 17 = 21
5 + 16 = 21
7 + 14 = 21
39 + 57 = 96
25 + 80 = 105
6 + 48 = 54
69 + 24 = 93
57 + 61 = 118
46 + 61 = 107
31 - 10 = 21
68 - 47 = 21