21 加法 49 等于多少？
21 + 49 = 70
21加法49 等于 70
竖式演算
验算
- 用减法验算：70 − 49 = 21
- 用减法验算：70 − 21 = 49
相关题目
21 + 48 = 69
21 + 50 = 71
21 + 47 = 68
21 + 51 = 72
21 + 46 = 67
21 + 52 = 73
21 + 53 = 74
21 + 45 = 66
20 + 49 = 69
22 + 49 = 71
19 + 49 = 68
23 + 49 = 72
24 + 49 = 73
18 + 49 = 67
25 + 49 = 74
17 + 49 = 66
1 + 69 = 70
2 + 68 = 70
3 + 67 = 70
4 + 66 = 70
5 + 65 = 70
6 + 64 = 70
95 + 90 = 185
72 + 95 = 167
8 + 57 = 65
6 + 69 = 75
81 + 91 = 172
96 + 20 = 116
86 - 16 = 70
10 × 7 = 70