12 加法 30 等于多少？
12 + 30 = 42
12加法30 等于 42
竖式演算
验算
- 用减法验算：42 − 30 = 12
- 用减法验算：42 − 12 = 30
相关题目
12 + 29 = 41
12 + 31 = 43
12 + 28 = 40
12 + 32 = 44
12 + 33 = 45
12 + 27 = 39
12 + 34 = 46
12 + 26 = 38
11 + 30 = 41
13 + 30 = 43
10 + 30 = 40
14 + 30 = 44
15 + 30 = 45
9 + 30 = 39
16 + 30 = 46
8 + 30 = 38
1 + 41 = 42
2 + 40 = 42
3 + 39 = 42
4 + 38 = 42
5 + 37 = 42
6 + 36 = 42
82 + 2 = 84
84 + 12 = 96
46 + 11 = 57
11 + 41 = 52
10 + 48 = 58
54 + 1 = 55
53 - 11 = 42
7 × 6 = 42