12 加法 31 等于多少？
12 + 31 = 43
12加法31 等于 43
竖式演算
验算
- 用减法验算：43 − 31 = 12
- 用减法验算：43 − 12 = 31
相关题目
12 + 30 = 42
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12 + 28 = 40
12 + 34 = 46
12 + 35 = 47
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11 + 31 = 42
13 + 31 = 44
10 + 31 = 41
14 + 31 = 45
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2 + 41 = 43
3 + 40 = 43
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5 + 38 = 43
6 + 37 = 43
37 + 42 = 79
46 + 40 = 86
41 + 46 = 87
87 + 2 = 89
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62 - 19 = 43