来自陈宇晨的问题
【一只青蛙掉到一口井里（井深10米）,它白天向上爬3米,晚上向下滑2米,这只青蛙几天可以爬出井?】
一只青蛙掉到一口井里（井深10米）,它白天向上爬3米,晚上向下滑2米,这只青蛙几天可以爬出井?
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2020-03-22 20:18
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宋海娜
(10-3)/(3-2)+1=8天
2020-03-22 20:21:27
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