10 加法 20 等于多少？
10 + 20 = 30
10加法20 等于 30
竖式演算
验算
- 用减法验算：30 − 20 = 10
- 用减法验算：30 − 10 = 20
相关题目
10 + 19 = 29
10 + 21 = 31
10 + 22 = 32
10 + 18 = 28
10 + 23 = 33
10 + 17 = 27
10 + 24 = 34
10 + 16 = 26
11 + 20 = 31
9 + 20 = 29
12 + 20 = 32
8 + 20 = 28
13 + 20 = 33
7 + 20 = 27
14 + 20 = 34
6 + 20 = 26
1 + 29 = 30
2 + 28 = 30
3 + 27 = 30
4 + 26 = 30
5 + 25 = 30
6 + 24 = 30
81 + 4 = 85
18 + 31 = 49
39 + 50 = 89
71 + 1 = 72
22 + 22 = 44
75 + 11 = 86
34 - 4 = 30
70 - 40 = 30