試解

來源: 於 2023-12-23 13:44:03 [舊帖] [給我悄悄話] 本文已被閱讀：次

AB:BD=2/3

CD:AC=3/4

if AD=1, then AB=2/5, CD=3/7 and then BC=6/35

know one area and can solve the rest