20 加法 70 等于多少？
20 + 70 = 90
20加法70 等于 90
竖式演算
验算
- 用减法验算：90 − 70 = 20
- 用减法验算：90 − 20 = 70
相关题目
20 + 69 = 89
20 + 71 = 91
20 + 68 = 88
20 + 72 = 92
20 + 67 = 87
20 + 73 = 93
20 + 74 = 94
20 + 66 = 86
19 + 70 = 89
21 + 70 = 91
22 + 70 = 92
18 + 70 = 88
23 + 70 = 93
17 + 70 = 87
24 + 70 = 94
16 + 70 = 86
1 + 89 = 90
2 + 88 = 90
3 + 87 = 90
4 + 86 = 90
5 + 85 = 90
6 + 84 = 90
51 + 42 = 93
65 + 10 = 75
21 + 56 = 77
3 + 72 = 75
58 + 41 = 99
36 + 40 = 76
2 × 45 = 90
10 × 9 = 90