89 减法 79 等于多少？
89 - 79 = 10
89减法79 等于 10
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验算
- 用加法验算：10 + 79 = 89
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89 - 78 = 11
89 - 80 = 9
89 - 77 = 12
89 - 81 = 8
89 - 76 = 13
89 - 82 = 7
89 - 83 = 6
89 - 75 = 14
88 - 79 = 9
90 - 79 = 11
91 - 79 = 12
87 - 79 = 8
92 - 79 = 13
86 - 79 = 7
93 - 79 = 14
85 - 79 = 6
11 - 1 = 10
12 - 2 = 10
13 - 3 = 10
14 - 4 = 10
15 - 5 = 10
16 - 6 = 10
87 - 3 = 84
27 - 21 = 6
97 - 4 = 93
14 - 10 = 4
63 - 11 = 52
22 - 1 = 21
5 + 5 = 10
8 + 2 = 10