89 减法 21 等于多少?
89 - 21 = 68
89减法21 等于 68
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验算
- 用加法验算:68 + 21 = 89
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89 - 20 = 69
89 - 22 = 67
89 - 19 = 70
89 - 23 = 66
89 - 24 = 65
89 - 18 = 71
89 - 25 = 64
89 - 17 = 72
88 - 21 = 67
90 - 21 = 69
87 - 21 = 66
91 - 21 = 70
86 - 21 = 65
92 - 21 = 71
85 - 21 = 64
93 - 21 = 72
69 - 1 = 68
70 - 2 = 68
71 - 3 = 68
72 - 4 = 68
73 - 5 = 68
74 - 6 = 68
79 - 42 = 37
92 - 52 = 40
48 - 14 = 34
68 - 46 = 22
67 - 21 = 46
86 - 12 = 74
38 + 30 = 68
52 + 16 = 68