87 加法 21 等于多少？
87 + 21 = 108
87加法21 等于 108
竖式演算
验算
- 用减法验算：108 − 21 = 87
- 用减法验算：108 − 87 = 21
相关题目
87 + 20 = 107
87 + 22 = 109
87 + 19 = 106
87 + 23 = 110
87 + 24 = 111
87 + 18 = 105
87 + 25 = 112
87 + 17 = 104
86 + 21 = 107
88 + 21 = 109
85 + 21 = 106
89 + 21 = 110
84 + 21 = 105
90 + 21 = 111
83 + 21 = 104
91 + 21 = 112
8 + 100 = 108
9 + 99 = 108
10 + 98 = 108
11 + 97 = 108
12 + 96 = 108
13 + 95 = 108
82 + 33 = 115
6 + 28 = 34
8 + 67 = 75
52 + 91 = 143
62 + 73 = 135
60 + 93 = 153
9 × 12 = 108
4 × 27 = 108