28 减法 27 等于多少？
28 - 27 = 1
28减法27 等于 1
竖式演算
验算
- 用加法验算：1 + 27 = 28
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28 - 26 = 2
28 - 28 = 0
28 - 25 = 3
28 - 24 = 4
28 - 23 = 5
28 - 22 = 6
28 - 21 = 7
28 - 20 = 8
27 - 27 = 0
29 - 27 = 2
30 - 27 = 3
31 - 27 = 4
32 - 27 = 5
33 - 27 = 6
34 - 27 = 7
35 - 27 = 8
2 - 1 = 1
3 - 2 = 1
4 - 3 = 1
5 - 4 = 1
6 - 5 = 1
7 - 6 = 1
54 - 21 = 33
58 - 4 = 54
45 - 3 = 42
77 - 40 = 37
58 - 14 = 44
34 - 22 = 12
1 × 1 = 1
42 - 9 = 33