56 加法 21 等于多少？
56 + 21 = 77
56加法21 等于 77
竖式演算
验算
- 用减法验算：77 − 21 = 56
- 用减法验算：77 − 56 = 21
相关题目
56 + 20 = 76
56 + 22 = 78
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56 + 23 = 79
56 + 24 = 80
56 + 18 = 74
56 + 25 = 81
56 + 17 = 73
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57 + 21 = 78
58 + 21 = 79
54 + 21 = 75
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2 + 75 = 77
3 + 74 = 77
4 + 73 = 77
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6 + 71 = 77
11 + 52 = 63
12 + 84 = 96
1 + 64 = 65
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86 - 9 = 77