一球从100米高度自由落下，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 from a free-fall height of 100 meters, each fall to the ground half the height of anti-jump back to the original then fall, seeking its 10th floor, the total number of meters aft