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3 abcd ac - PowerPoint PPT Presentation

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????. A. D. B. C. ?????????????? ?. 5.3 ????? ? ?? (2). ??????? ABCD ????? AC ? BD ???? O. O. 2. 3. 4. 1. ?? : OA=OC,OB=OD. ??????????????????. A. D. ?? ? ??? ABCD ??????. ? AD?BC. B. C. ?? 1=?2, ?3=?4. ? ? AD=BC. ? ?AOD??COB. ? OA=OC,OB=OD. ?? ABCD ??

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3 abcd ac - PowerPoint PPT Presentation

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