15 加法 42 等于多少？
15 + 42 = 57
15加法42 等于 57
竖式演算
验算
- 用减法验算：57 − 42 = 15
- 用减法验算：57 − 15 = 42
相关题目
15 + 41 = 56
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15 + 45 = 60
15 + 38 = 53
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14 + 42 = 56
16 + 42 = 58
13 + 42 = 55
17 + 42 = 59
12 + 42 = 54
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2 + 55 = 57
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