那个小球每次落下弹起的高度是上次的2/5,题中告知第一次落下弹起的高度为125,那第二次即2/5*125,第三次落地弹起的高度为2/5*2/5*125,第四次为2/5*2/5*2/5*125,约分过后为2*2*2=8
英语翻译If after each bounce it reaches 2/5 of the previous heig
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