20 加法 31 等于多少？
20 + 31 = 51
20加法31 等于 51
竖式演算
验算
- 用减法验算：51 − 31 = 20
- 用减法验算：51 − 20 = 31
相关题目
20 + 30 = 50
20 + 32 = 52
20 + 29 = 49
20 + 33 = 53
20 + 28 = 48
20 + 34 = 54
20 + 35 = 55
20 + 27 = 47
19 + 31 = 50
21 + 31 = 52
22 + 31 = 53
18 + 31 = 49
23 + 31 = 54
17 + 31 = 48
24 + 31 = 55
16 + 31 = 47
1 + 50 = 51
2 + 49 = 51
3 + 48 = 51
4 + 47 = 51
5 + 46 = 51
6 + 45 = 51
23 + 44 = 67
10 + 47 = 57
100 + 30 = 130
12 + 7 = 19
65 + 4 = 69
51 + 33 = 84
1 × 51 = 51
54 - 3 = 51