49 加法 21 等于多少？
49 + 21 = 70
49加法21 等于 70
竖式演算
验算
- 用减法验算：70 − 21 = 49
- 用减法验算：70 − 49 = 21
相关题目
49 + 20 = 69
49 + 22 = 71
49 + 19 = 68
49 + 23 = 72
49 + 24 = 73
49 + 18 = 67
49 + 25 = 74
49 + 17 = 66
48 + 21 = 69
50 + 21 = 71
47 + 21 = 68
51 + 21 = 72
46 + 21 = 67
52 + 21 = 73
53 + 21 = 74
45 + 21 = 66
1 + 69 = 70
2 + 68 = 70
3 + 67 = 70
4 + 66 = 70
5 + 65 = 70
6 + 64 = 70
87 + 92 = 179
56 + 36 = 92
71 + 31 = 102
86 + 83 = 169
41 + 62 = 103
14 + 39 = 53
93 - 23 = 70
84 - 14 = 70