20 加法 30 等于多少？
20 + 30 = 50
20加法30 等于 50
竖式演算
验算
- 用减法验算：50 − 30 = 20
- 用减法验算：50 − 20 = 30
相关题目
20 + 29 = 49
20 + 31 = 51
20 + 28 = 48
20 + 32 = 52
20 + 33 = 53
20 + 27 = 47
20 + 34 = 54
20 + 26 = 46
19 + 30 = 49
21 + 30 = 51
22 + 30 = 52
18 + 30 = 48
23 + 30 = 53
17 + 30 = 47
24 + 30 = 54
16 + 30 = 46
1 + 49 = 50
2 + 48 = 50
3 + 47 = 50
4 + 46 = 50
5 + 45 = 50
6 + 44 = 50
4 + 25 = 29
2 + 87 = 89
50 + 12 = 62
96 + 2 = 98
31 + 52 = 83
40 + 27 = 67
81 - 31 = 50
67 - 17 = 50