30 减法 27 等于多少？
30 - 27 = 3
30减法27 等于 3
竖式演算
验算
- 用加法验算：3 + 27 = 30
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30 - 26 = 4
30 - 28 = 2
30 - 29 = 1
30 - 25 = 5
30 - 30 = 0
30 - 24 = 6
30 - 23 = 7
30 - 22 = 8
29 - 27 = 2
31 - 27 = 4
28 - 27 = 1
32 - 27 = 5
27 - 27 = 0
33 - 27 = 6
34 - 27 = 7
35 - 27 = 8
4 - 1 = 3
5 - 2 = 3
6 - 3 = 3
7 - 4 = 3
8 - 5 = 3
9 - 6 = 3
42 - 4 = 38
74 - 28 = 46
91 - 59 = 32
40 - 18 = 22
80 - 61 = 19
62 - 46 = 16
1 × 3 = 3
2 + 1 = 3