21 加法 77 等于多少？
21 + 77 = 98
21加法77 等于 98
竖式演算
验算
- 用减法验算：98 − 77 = 21
- 用减法验算：98 − 21 = 77
相关题目
21 + 76 = 97
21 + 78 = 99
21 + 75 = 96
21 + 79 = 100
21 + 74 = 95
21 + 80 = 101
21 + 73 = 94
21 + 81 = 102
20 + 77 = 97
22 + 77 = 99
19 + 77 = 96
23 + 77 = 100
24 + 77 = 101
18 + 77 = 95
25 + 77 = 102
17 + 77 = 94
1 + 97 = 98
2 + 96 = 98
3 + 95 = 98
4 + 94 = 98
5 + 93 = 98
6 + 92 = 98
66 + 21 = 87
67 + 10 = 77
42 + 5 = 47
10 + 16 = 26
22 + 22 = 44
72 + 15 = 87
49 × 2 = 98
99 - 1 = 98