23 减法 21 等于多少？
23 - 21 = 2
23减法21 等于 2
竖式演算
验算
- 用加法验算：2 + 21 = 23
相关题目
23 - 20 = 3
23 - 22 = 1
23 - 19 = 4
23 - 23 = 0
23 - 18 = 5
23 - 17 = 6
23 - 16 = 7
23 - 15 = 8
22 - 21 = 1
24 - 21 = 3
21 - 21 = 0
25 - 21 = 4
26 - 21 = 5
27 - 21 = 6
28 - 21 = 7
29 - 21 = 8
3 - 1 = 2
4 - 2 = 2
5 - 3 = 2
6 - 4 = 2
7 - 5 = 2
8 - 6 = 2
24 - 20 = 4
99 - 63 = 36
76 - 76 = 0
46 - 35 = 11
18 - 10 = 8
38 - 1 = 37
1 × 2 = 2
1 + 1 = 2