21 加法 59 等于多少？
21 + 59 = 80
21加法59 等于 80
竖式演算
验算
- 用减法验算：80 − 59 = 21
- 用减法验算：80 − 21 = 59
相关题目
21 + 58 = 79
21 + 60 = 81
21 + 57 = 78
21 + 61 = 82
21 + 56 = 77
21 + 62 = 83
21 + 55 = 76
21 + 63 = 84
20 + 59 = 79
22 + 59 = 81
19 + 59 = 78
23 + 59 = 82
24 + 59 = 83
18 + 59 = 77
25 + 59 = 84
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2 + 78 = 80
3 + 77 = 80
4 + 76 = 80
5 + 75 = 80
6 + 74 = 80
69 + 8 = 77
59 + 15 = 74
91 + 35 = 126
84 + 81 = 165
56 + 35 = 91
73 + 52 = 125
82 - 2 = 80
96 - 16 = 80