21 加法 78 等于多少？
21 + 78 = 99
21加法78 等于 99
竖式演算
验算
- 用减法验算：99 − 78 = 21
- 用减法验算：99 − 21 = 78
相关题目
21 + 77 = 98
21 + 79 = 100
21 + 76 = 97
21 + 80 = 101
21 + 75 = 96
21 + 81 = 102
21 + 74 = 95
21 + 82 = 103
20 + 78 = 98
22 + 78 = 100
19 + 78 = 97
23 + 78 = 101
24 + 78 = 102
18 + 78 = 96
25 + 78 = 103
17 + 78 = 95
1 + 98 = 99
2 + 97 = 99
3 + 96 = 99
4 + 95 = 99
5 + 94 = 99
6 + 93 = 99
12 + 40 = 52
12 + 76 = 88
20 + 76 = 96
7 + 12 = 19
40 + 47 = 87
25 + 70 = 95
11 × 9 = 99
3 × 33 = 99