69 加法 21 等于多少？
69 + 21 = 90
69加法21 等于 90
竖式演算
验算
- 用减法验算：90 − 21 = 69
- 用减法验算：90 − 69 = 21
相关题目
69 + 20 = 89
69 + 22 = 91
69 + 19 = 88
69 + 23 = 92
69 + 24 = 93
69 + 18 = 87
69 + 25 = 94
69 + 17 = 86
68 + 21 = 89
70 + 21 = 91
67 + 21 = 88
71 + 21 = 92
66 + 21 = 87
72 + 21 = 93
65 + 21 = 86
73 + 21 = 94
1 + 89 = 90
2 + 88 = 90
3 + 87 = 90
4 + 86 = 90
5 + 85 = 90
6 + 84 = 90
52 + 86 = 138
31 + 81 = 112
42 + 91 = 133
58 + 29 = 87
7 + 86 = 93
50 + 65 = 115
92 - 2 = 90
98 - 8 = 90