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證明:∵四邊形ABCD是菱形,∴∠BCE=∠DCE,BC=CD,AB‖CD,∴∠AFD=∠CDE,在△BCE和△DCE中BC=CD∠BCE=∠DCECE=CE∴△BCE≌△DCE,∴∠CBE=∠CDE,∵∠AFD=∠CDE,∴∠AFD=∠CBE.
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