21 减法 21 等于多少？
21 - 21 = 0
21减法21 等于 0
竖式演算
验算
- 用加法验算：0 + 21 = 21
相关题目
21 - 20 = 1
21 - 19 = 2
21 - 18 = 3
21 - 17 = 4
21 - 16 = 5
21 - 15 = 6
21 - 14 = 7
21 - 13 = 8
22 - 21 = 1
23 - 21 = 2
24 - 21 = 3
25 - 21 = 4
26 - 21 = 5
27 - 21 = 6
28 - 21 = 7
29 - 21 = 8
1 - 1 = 0
2 - 2 = 0
3 - 3 = 0
4 - 4 = 0
5 - 5 = 0
6 - 6 = 0
89 - 78 = 11
47 - 24 = 23
66 - 16 = 50
53 - 30 = 23
69 - 58 = 11
48 - 31 = 17
86 - 51 = 35
71 - 63 = 8