2 加法 77 等于多少？
2 + 77 = 79
2加法77 等于 79
竖式演算
验算
- 用减法验算：79 − 77 = 2
- 用减法验算：79 − 2 = 77
相关题目
2 + 76 = 78
2 + 78 = 80
2 + 75 = 77
2 + 79 = 81
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2 + 80 = 82
2 + 73 = 75
2 + 81 = 83
1 + 77 = 78
3 + 77 = 80
4 + 77 = 81
5 + 77 = 82
6 + 77 = 83
7 + 77 = 84
8 + 77 = 85
9 + 77 = 86
1 + 78 = 79
3 + 76 = 79
4 + 75 = 79
5 + 74 = 79
6 + 73 = 79
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32 + 44 = 76
57 + 21 = 78
26 + 43 = 69
42 + 42 = 84
13 + 54 = 67
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91 - 12 = 79
99 - 20 = 79