40 加法 9 等于多少？
40 + 9 = 49
40加法9 等于 49
竖式演算
验算
- 用减法验算：49 − 9 = 40
- 用减法验算：49 − 40 = 9
相关题目
40 + 8 = 48
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40 + 6 = 46
40 + 13 = 53
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39 + 9 = 48
41 + 9 = 50
38 + 9 = 47
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2 + 47 = 49
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82 - 33 = 49