21 加法 87 等于多少？
21 + 87 = 108
21加法87 等于 108
竖式演算
验算
- 用减法验算：108 − 87 = 21
- 用减法验算：108 − 21 = 87
相关题目
21 + 86 = 107
21 + 88 = 109
21 + 85 = 106
21 + 89 = 110
21 + 84 = 105
21 + 90 = 111
21 + 83 = 104
21 + 91 = 112
20 + 87 = 107
22 + 87 = 109
19 + 87 = 106
23 + 87 = 110
24 + 87 = 111
18 + 87 = 105
25 + 87 = 112
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8 + 100 = 108
9 + 99 = 108
10 + 98 = 108
11 + 97 = 108
12 + 96 = 108
13 + 95 = 108
7 + 56 = 63
80 + 46 = 126
61 + 42 = 103
51 + 70 = 121
60 + 69 = 129
29 + 90 = 119
9 × 12 = 108
12 × 9 = 108