28 减法 21 等于多少？
28 - 21 = 7
28减法21 等于 7
竖式演算
验算
- 用加法验算：7 + 21 = 28
相关题目
28 - 20 = 8
28 - 22 = 6
28 - 19 = 9
28 - 23 = 5
28 - 24 = 4
28 - 18 = 10
28 - 25 = 3
28 - 17 = 11
27 - 21 = 6
29 - 21 = 8
26 - 21 = 5
30 - 21 = 9
31 - 21 = 10
25 - 21 = 4
32 - 21 = 11
24 - 21 = 3
8 - 1 = 7
9 - 2 = 7
10 - 3 = 7
11 - 4 = 7
12 - 5 = 7
13 - 6 = 7
63 - 60 = 3
46 - 5 = 41
77 - 50 = 27
96 - 31 = 65
73 - 1 = 72
72 - 71 = 1
6 + 1 = 7
5 + 2 = 7