推 justin0602 : 謝謝解惑 09/28 18:44
※ 引述《justin0602 (justin)》之銘言：
: http://ppt.cc/fHbu
: ANS:126
令該內點為 P, 又令 D E F 分別是三條直線跟 BC AC AB 交的點
看 A-P-D 有 △ABP:△BPD = △ACP:△CPD 即 (84+y):40 = (x+35):30
看 B-P-E 有 △BCP:△CPE = △BAP:△APE 即 (84+y):x = 70:35
看 C-P-F 有 △CAP:△APF = △CBP:△BPF 即 (35+x):84 = 70:y
任取兩條聯立可解得 x = 70, y = 56
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這題跟相似好像無關...
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'Oh, Harry, don't you see?' Hermione breathed. 'If she could have done
one thing to make absolutely sure that every single person in this school
will read your interview, it was banning it!'
---'Harry Potter and the order of the phoenix', P513
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