20 加法 61 等于多少？
20 + 61 = 81
20加法61 等于 81
竖式演算
验算
- 用减法验算：81 − 61 = 20
- 用减法验算：81 − 20 = 61
相关题目
20 + 60 = 80
20 + 62 = 82
20 + 59 = 79
20 + 63 = 83
20 + 58 = 78
20 + 64 = 84
20 + 65 = 85
20 + 57 = 77
19 + 61 = 80
21 + 61 = 82
22 + 61 = 83
18 + 61 = 79
23 + 61 = 84
17 + 61 = 78
24 + 61 = 85
16 + 61 = 77
1 + 80 = 81
2 + 79 = 81
3 + 78 = 81
4 + 77 = 81
5 + 76 = 81
6 + 75 = 81
42 + 4 = 46
40 + 9 = 49
84 + 13 = 97
33 + 65 = 98
26 + 2 = 28
17 + 82 = 99
98 - 17 = 81
97 - 16 = 81