89 加法 21 等于多少？
89 + 21 = 110
89加法21 等于 110
竖式演算
验算
- 用减法验算：110 − 21 = 89
- 用减法验算：110 − 89 = 21
相关题目
89 + 20 = 109
89 + 22 = 111
89 + 19 = 108
89 + 23 = 112
89 + 24 = 113
89 + 18 = 107
89 + 25 = 114
89 + 17 = 106
88 + 21 = 109
90 + 21 = 111
87 + 21 = 108
91 + 21 = 112
92 + 21 = 113
86 + 21 = 107
93 + 21 = 114
85 + 21 = 106
10 + 100 = 110
11 + 99 = 110
12 + 98 = 110
13 + 97 = 110
14 + 96 = 110
15 + 95 = 110
79 + 71 = 150
77 + 45 = 122
47 + 87 = 134
9 + 96 = 105
99 + 72 = 171
49 + 56 = 105
10 × 11 = 110
55 × 2 = 110