21 加法 57 等于多少？
21 + 57 = 78
21加法57 等于 78
竖式演算
验算
- 用减法验算：78 − 57 = 21
- 用减法验算：78 − 21 = 57
相关题目
21 + 56 = 77
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21 + 59 = 80
21 + 60 = 81
21 + 54 = 75
21 + 61 = 82
21 + 53 = 74
20 + 57 = 77
22 + 57 = 79
19 + 57 = 76
23 + 57 = 80
24 + 57 = 81
18 + 57 = 75
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1 + 77 = 78
2 + 76 = 78
3 + 75 = 78
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5 + 73 = 78
6 + 72 = 78
12 + 52 = 64
14 + 83 = 97
100 + 3 = 103
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23 + 15 = 38
10 + 26 = 36
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83 - 5 = 78