70 加法 21 等于多少？
70 + 21 = 91
70加法21 等于 91
竖式演算
验算
- 用减法验算：91 − 21 = 70
- 用减法验算：91 − 70 = 21
相关题目
70 + 20 = 90
70 + 22 = 92
70 + 19 = 89
70 + 23 = 93
70 + 24 = 94
70 + 18 = 88
70 + 25 = 95
70 + 17 = 87
69 + 21 = 90
71 + 21 = 92
68 + 21 = 89
72 + 21 = 93
67 + 21 = 88
73 + 21 = 94
74 + 21 = 95
66 + 21 = 87
1 + 90 = 91
2 + 89 = 91
3 + 88 = 91
4 + 87 = 91
5 + 86 = 91
6 + 85 = 91
30 + 39 = 69
97 + 2 = 99
13 + 4 = 17
65 + 2 = 67
50 + 38 = 88
1 + 32 = 33
13 × 7 = 91
95 - 4 = 91