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相等連接BD,CE容易得:BCD和CDE全等,則BD=CE,連接BE,容易得:BDE和BCE全等,∠CBE和∠DEB相等,又AB=AE,所以∠ABE=∠AEB,所以∠ABC=∠AED,連接AC,AD,容易證明三角形全等,所以AC=AD.
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