40 减法 21 等于多少？
40 - 21 = 19
40减法21 等于 19
竖式演算
验算
- 用加法验算：19 + 21 = 40
相关题目
40 - 20 = 20
40 - 22 = 18
40 - 19 = 21
40 - 23 = 17
40 - 24 = 16
40 - 18 = 22
40 - 25 = 15
40 - 17 = 23
39 - 21 = 18
41 - 21 = 20
42 - 21 = 21
38 - 21 = 17
43 - 21 = 22
37 - 21 = 16
44 - 21 = 23
36 - 21 = 15
20 - 1 = 19
21 - 2 = 19
22 - 3 = 19
23 - 4 = 19
24 - 5 = 19
25 - 6 = 19
92 - 3 = 89
71 - 64 = 7
98 - 49 = 49
90 - 8 = 82
81 - 63 = 18
93 - 18 = 75
5 + 14 = 19
3 + 16 = 19