84 加法 21 等于多少？
84 + 21 = 105
84加法21 等于 105
竖式演算
验算
- 用减法验算：105 − 21 = 84
- 用减法验算：105 − 84 = 21
相关题目
84 + 20 = 104
84 + 22 = 106
84 + 19 = 103
84 + 23 = 107
84 + 24 = 108
84 + 18 = 102
84 + 25 = 109
84 + 17 = 101
83 + 21 = 104
85 + 21 = 106
82 + 21 = 103
86 + 21 = 107
87 + 21 = 108
81 + 21 = 102
88 + 21 = 109
80 + 21 = 101
5 + 100 = 105
6 + 99 = 105
7 + 98 = 105
8 + 97 = 105
9 + 96 = 105
10 + 95 = 105
23 + 91 = 114
54 + 73 = 127
85 + 7 = 92
55 + 93 = 148
7 + 49 = 56
54 + 83 = 137
7 × 15 = 105
15 × 7 = 105