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qiuluoxia
- 一球从100米高处落下,每次落地后反跳回原高度的一半,再落下,求它在 第10次落地时,共经过多少米?第10次反弹多高?-A ball dropped from 100 meters high, each counter after landing jumps back to half its original height, and then falls, find it at the 10th floor, a total of how many meters? 10th rebou