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# answer72 - 7201 AB 1 1 2 3 4 2 n B A1 A2 A3 B1 B2 B3 C1 C 2...

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¤ N ı * ¨ 5 ¤ 2 A B 3 1 B B 3 1 C B 3 , 1 1. A B B C B 2. B C B A B 3. C A B B B 4. A C B B (1) 3 2 1 3 2 1 3 2 1 , , , , , , , , C C C B B B A A A B B C C C B B B A A A , , , , , , , , 1 C A ∆∆∆∆∆∆∆ °¬∝♠ Ε A 2 •♠ A B B 2 •♠ B B C 2 •♠ C B B B AAA •♠ CCC BBB , 1 3 2 1 A A A B B 3 2 1 , , Ξ B B C B 3 (υ C B (2)1 BBB Ξ # BBB B CCC •♠ (1 C ) 3 2 A ABBBA 0 1 3 1 ABBBA A 0 1 ABBB A A 2 1 0 1 3 ABBABA 4 1 AB ABBA 2 1 1 3 ABABBA 4 1 ABBAB A 1 1 1 ABB ABA 2 1 1 ABABB A 1 1 1 ABABAB 10 1 1 22 1 1 22 1 (3)1 C C C B B B A A A , , , , , , , , Ξ # 1 4752 6 22 ) ! 3 ( 22 3 3 = × = × 7201

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D C B A 2 a x 12- x a a A B C D 6 4 5 3 2 1 E A B C D 10 1 .9 - 1 1 ADC B ADC =9 0 ° Bh AB + BC =121 BD =1 1 1 BC B EB CE = AB B DE B BD 4 + 6 = 180 ° = 5 + 6 4 = 5 1 DA = DC DAB 2245 DCE ( SAS ) BD = ED B B 1 = 2 12 = AB + BC = CE + BC = BE EDB = 2 + 3 = 1 + 3 = 90 ° EDB BD = DE = 2 BE =6 2 1 1 a (12 - x ) + a x = 2 a BD
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