21 加法 69 等于多少？
21 + 69 = 90
21加法69 等于 90
竖式演算
验算
- 用减法验算：90 − 69 = 21
- 用减法验算：90 − 21 = 69
相关题目
21 + 68 = 89
21 + 70 = 91
21 + 67 = 88
21 + 71 = 92
21 + 66 = 87
21 + 72 = 93
21 + 65 = 86
21 + 73 = 94
20 + 69 = 89
22 + 69 = 91
19 + 69 = 88
23 + 69 = 92
24 + 69 = 93
18 + 69 = 87
25 + 69 = 94
17 + 69 = 86
1 + 89 = 90
2 + 88 = 90
3 + 87 = 90
4 + 86 = 90
5 + 85 = 90
6 + 84 = 90
86 + 21 = 107
71 + 70 = 141
57 + 28 = 85
4 + 49 = 53
12 + 49 = 61
4 + 28 = 32
94 - 4 = 90
99 - 9 = 90