70 减法 69 等于多少？
70 - 69 = 1
70减法69 等于 1
竖式演算
验算
- 用加法验算：1 + 69 = 70
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70 - 68 = 2
70 - 70 = 0
70 - 67 = 3
70 - 66 = 4
70 - 65 = 5
70 - 64 = 6
70 - 63 = 7
70 - 62 = 8
69 - 69 = 0
71 - 69 = 2
72 - 69 = 3
73 - 69 = 4
74 - 69 = 5
75 - 69 = 6
76 - 69 = 7
77 - 69 = 8
2 - 1 = 1
3 - 2 = 1
4 - 3 = 1
5 - 4 = 1
6 - 5 = 1
7 - 6 = 1
91 - 66 = 25
23 - 17 = 6
72 - 34 = 38
51 - 2 = 49
57 - 28 = 29
1 × 1 = 1
67 - 34 = 33
60 - 26 = 34