摘要
有一只贪吃的老鼠吃一堆花生米．第一天吃了总数的1/10又1/10粒，第二天吃了剩下的1/9又粒，依次类推，……第九天吃了剩下的1/2又1/2粒．这时还剩下10粒．问原来共有多少粒花生米？
There has been a greedy rat eating a heap of peanuts, he ate one-tenth of all peanuts and one-tenth peanut at first day, and ate one-ninth of remaining peanuts and one -ninth peanut at second day, the rest may be deduced by analogy, at the ninth day, he ate half of remaining peanuts and half peanut. At last, there were ten peanuts. How many peanuts were there at first？
