49 加法 20 等于多少？
49 + 20 = 69
49加法20 等于 69
竖式演算
验算
- 用减法验算：69 − 20 = 49
- 用减法验算：69 − 49 = 20
相关题目
49 + 19 = 68
49 + 21 = 70
49 + 22 = 71
49 + 18 = 67
49 + 23 = 72
49 + 17 = 66
49 + 24 = 73
49 + 16 = 65
48 + 20 = 68
50 + 20 = 70
47 + 20 = 67
51 + 20 = 71
46 + 20 = 66
52 + 20 = 72
53 + 20 = 73
45 + 20 = 65
1 + 68 = 69
2 + 67 = 69
3 + 66 = 69
4 + 65 = 69
5 + 64 = 69
6 + 63 = 69
2 + 31 = 33
42 + 100 = 142
22 + 57 = 79
8 + 30 = 38
33 + 2 = 35
8 + 90 = 98
95 - 26 = 69
98 - 29 = 69