21 加法 84 等于多少？
21 + 84 = 105
21加法84 等于 105
竖式演算
验算
- 用减法验算：105 − 84 = 21
- 用减法验算：105 − 21 = 84
相关题目
21 + 83 = 104
21 + 85 = 106
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21 + 86 = 107
21 + 87 = 108
21 + 81 = 102
21 + 88 = 109
21 + 80 = 101
20 + 84 = 104
22 + 84 = 106
19 + 84 = 103
23 + 84 = 107
24 + 84 = 108
18 + 84 = 102
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6 + 99 = 105
7 + 98 = 105
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10 + 95 = 105
36 + 18 = 54
64 + 42 = 106
82 + 63 = 145
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7 × 15 = 105
35 × 3 = 105