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證明: ∵四邊形ABCD是平行四邊形 ∴AB=CD,AD=BC,∠BAD=∠BCD ∵△ADE和△BCF都是等邊三角形 ∴AE=AD=BC=CF,∠EAD=∠BCF=60° ∴∠BAE=∠DCF ∴△BAE≌△DCF ∴BE=DF
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