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證明: ∵DE‖BC ∴△ADE∽△ABC ∴AD/AB=AE/AC ∵EF‖CD ∴△AFE∽△ADC ∴AF/AD=AE/AC ∴AF/AD=AD/AB ∴AF:AD=AD:AB 數學輔導團解答了你的提問,
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