15 加法 40 等于多少？
15 + 40 = 55
15加法40 等于 55
竖式演算
验算
- 用减法验算：55 − 40 = 15
- 用减法验算：55 − 15 = 40
相关题目
15 + 39 = 54
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15 + 37 = 52
15 + 43 = 58
15 + 44 = 59
15 + 36 = 51
14 + 40 = 54
16 + 40 = 56
13 + 40 = 53
17 + 40 = 57
12 + 40 = 52
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2 + 53 = 55
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66 + 1 = 67
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