21 加法 99 等于多少？
21 + 99 = 120
21加法99 等于 120
竖式演算
验算
- 用减法验算：120 − 99 = 21
- 用减法验算：120 − 21 = 99
相关题目
21 + 98 = 119
21 + 100 = 121
21 + 97 = 118
21 + 96 = 117
21 + 95 = 116
21 + 94 = 115
21 + 93 = 114
21 + 92 = 113
20 + 99 = 119
22 + 99 = 121
19 + 99 = 118
23 + 99 = 122
24 + 99 = 123
18 + 99 = 117
25 + 99 = 124
17 + 99 = 116
20 + 100 = 120
22 + 98 = 120
23 + 97 = 120
24 + 96 = 120
25 + 95 = 120
26 + 94 = 120
64 + 59 = 123
71 + 79 = 150
19 + 98 = 117
55 + 88 = 143
89 + 45 = 134
77 + 97 = 174
8 × 15 = 120
24 × 5 = 120