30 加法 40 等于多少？
30 + 40 = 70
30加法40 等于 70
竖式演算
验算
- 用减法验算：70 − 40 = 30
- 用减法验算：70 − 30 = 40
相关题目
30 + 39 = 69
30 + 41 = 71
30 + 38 = 68
30 + 42 = 72
30 + 37 = 67
30 + 43 = 73
30 + 44 = 74
30 + 36 = 66
29 + 40 = 69
31 + 40 = 71
28 + 40 = 68
32 + 40 = 72
33 + 40 = 73
27 + 40 = 67
34 + 40 = 74
26 + 40 = 66
1 + 69 = 70
2 + 68 = 70
3 + 67 = 70
4 + 66 = 70
5 + 65 = 70
6 + 64 = 70
28 + 61 = 89
53 + 10 = 63
47 + 41 = 88
22 + 22 = 44
31 + 65 = 96
21 + 34 = 55
96 - 26 = 70
87 - 17 = 70