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證明:∵平行四邊形ABCD∴AB=CD,AD=BC,∠A=∠C,AB‖CD∵∠ADE=∠CBF∴△ADE≌△CBF(ASA)∴AE=CF∵BE=AB-AE,DF=CD-CF∴BE=CF∴平行四邊形BFDE(對邊平行且相等)
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