21 加法 70 等于多少？
21 + 70 = 91
21加法70 等于 91
竖式演算
验算
- 用减法验算：91 − 70 = 21
- 用减法验算：91 − 21 = 70
相关题目
21 + 69 = 90
21 + 71 = 92
21 + 68 = 89
21 + 72 = 93
21 + 67 = 88
21 + 73 = 94
21 + 74 = 95
21 + 66 = 87
20 + 70 = 90
22 + 70 = 92
19 + 70 = 89
23 + 70 = 93
24 + 70 = 94
18 + 70 = 88
25 + 70 = 95
17 + 70 = 87
1 + 90 = 91
2 + 89 = 91
3 + 88 = 91
4 + 87 = 91
5 + 86 = 91
6 + 85 = 91
13 + 100 = 113
5 + 3 = 8
32 + 37 = 69
23 + 100 = 123
52 + 37 = 89
13 + 3 = 16
98 - 7 = 91
97 - 6 = 91