70 加法 20 等于多少？
70 + 20 = 90
70加法20 等于 90
竖式演算
验算
- 用减法验算：90 − 20 = 70
- 用减法验算：90 − 70 = 20
相关题目
70 + 19 = 89
70 + 21 = 91
70 + 22 = 92
70 + 18 = 88
70 + 23 = 93
70 + 17 = 87
70 + 24 = 94
70 + 16 = 86
69 + 20 = 89
71 + 20 = 91
68 + 20 = 88
72 + 20 = 92
67 + 20 = 87
73 + 20 = 93
74 + 20 = 94
66 + 20 = 86
1 + 89 = 90
2 + 88 = 90
3 + 87 = 90
4 + 86 = 90
5 + 85 = 90
6 + 84 = 90
25 + 22 = 47
45 + 12 = 57
23 + 20 = 43
13 + 86 = 99
13 + 71 = 84
54 + 3 = 57
30 × 3 = 90
99 - 9 = 90