100 减法 21 等于多少？
100 - 21 = 79
100减法21 等于 79
竖式演算
验算
- 用加法验算：79 + 21 = 100
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100 - 20 = 80
100 - 22 = 78
100 - 19 = 81
100 - 23 = 77
100 - 24 = 76
100 - 18 = 82
100 - 25 = 75
100 - 17 = 83
99 - 21 = 78
98 - 21 = 77
97 - 21 = 76
96 - 21 = 75
95 - 21 = 74
94 - 21 = 73
93 - 21 = 72
92 - 21 = 71
80 - 1 = 79
81 - 2 = 79
82 - 3 = 79
83 - 4 = 79
84 - 5 = 79
85 - 6 = 79
100 - 55 = 45
100 - 95 = 5
100 - 88 = 12
100 - 89 = 11
100 - 4 = 96
100 - 57 = 43
34 + 45 = 79
38 + 41 = 79