40 加法 31 等于多少？
40 + 31 = 71
40加法31 等于 71
竖式演算
验算
- 用减法验算：71 − 31 = 40
- 用减法验算：71 − 40 = 31
相关题目
40 + 30 = 70
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40 + 34 = 74
40 + 35 = 75
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41 + 31 = 72
38 + 31 = 69
42 + 31 = 73
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2 + 69 = 71
3 + 68 = 71
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45 + 10 = 55
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