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这题让我想起童年

Posted by black_snow at 2009-07-27 15:03:42 on Problem 3619
   数学老师:有一只蜗牛,白天爬3m,晚上掉1.5米,井有9m问蜗牛几天能够爬上井口?
如果你回答对了,你就不会WA了...

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