78 加法 21 等于多少？
78 + 21 = 99
78加法21 等于 99
竖式演算
验算
- 用减法验算：99 − 21 = 78
- 用减法验算：99 − 78 = 21
相关题目
78 + 20 = 98
78 + 22 = 100
78 + 19 = 97
78 + 23 = 101
78 + 24 = 102
78 + 18 = 96
78 + 25 = 103
78 + 17 = 95
77 + 21 = 98
79 + 21 = 100
76 + 21 = 97
80 + 21 = 101
75 + 21 = 96
81 + 21 = 102
74 + 21 = 95
82 + 21 = 103
1 + 98 = 99
2 + 97 = 99
3 + 96 = 99
4 + 95 = 99
5 + 94 = 99
6 + 93 = 99
13 + 81 = 94
8 + 10 = 18
36 + 31 = 67
56 + 1 = 57
74 + 15 = 89
84 + 11 = 95
3 × 33 = 99
1 × 99 = 99