77 加法 21 等于多少？
77 + 21 = 98
77加法21 等于 98
竖式演算
验算
- 用减法验算：98 − 21 = 77
- 用减法验算：98 − 77 = 21
相关题目
77 + 20 = 97
77 + 22 = 99
77 + 19 = 96
77 + 23 = 100
77 + 24 = 101
77 + 18 = 95
77 + 25 = 102
77 + 17 = 94
76 + 21 = 97
78 + 21 = 99
75 + 21 = 96
79 + 21 = 100
74 + 21 = 95
80 + 21 = 101
73 + 21 = 94
81 + 21 = 102
1 + 97 = 98
2 + 96 = 98
3 + 95 = 98
4 + 94 = 98
5 + 93 = 98
6 + 92 = 98
10 + 78 = 88
64 + 24 = 88
65 + 34 = 99
12 + 66 = 78
90 + 9 = 99
31 + 24 = 55
49 × 2 = 98
7 × 14 = 98