[計量] 一個長方形...我不會畫圖...> <
rectagle ABCD where AB=30 feet AD=50 feet
one child stands at B while another child runs back and forth along the entire
side AD. If the running child is in a position randomly located along side AD
at a given time, what is the probability that the two childeren are at most
50 feet apart at that time?
Ans. 4/5 .....不會用BBS的人生.....> < 感激！！
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