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證明:∵AC平分∠BCD,BD平分∠ABC,∴∠DBC=12∠ABC,∠ACB=12∠DCB,∵∠ABC=∠DCB,∴∠ACB=∠DBC,∵在△ABC與△DCB中,∠ABC=∠DCBBC=BC∠ACB=∠DBC,∴△ABC≌△DCB,∴AB=DC.
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