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∆ABD 面積 = ?

Autor:羅驥韡 (Pegasus Roe)
Subiect:Aria, Triunghiuri
如圖：∆ABC 面積 = 8, ∆ACE 面積 = 7, ∆CDE 面積 = 9, 求 ∆ABD 面積 = ？ 答案：不一定！

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