※ 引述《mrjj123 (RRRRRRRR)》之銘言：
: https://i.imgur.com/Di5UEmV.jpg
: 請問這題要怎麼算呢
BD = kBP
= (k/8)BA + (5k/8)BC
=> k + 5k = 8
=> k = 4/3
=> x = 1/6
y = 5/6
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