摘要:A.∠AOB=60° B.∠ADB=60° C.∠AEB=60° D.∠AEB=30°
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①△ACE≌△BCD,②BG=AF,③△DCG≌△ECF,④△ADB≌△CEA,⑤DE=DG,⑥∠AOB=60°.
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