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證明:【O是對角線交點.不知圖,設E在AO上】 ∵ABCD是矩形 ∴AC=BD且互相平分,即AO=BO=CO=DO ∵AE=AF,OE=AO-AE,OF=OD-DF ∴OE=OF 又∵∠EOB=∠FOC,OB=OC ∴⊿BOE≌⊿COF
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