26.如圖,Rt△ABC中,∠ACB=90°,D為AB中點(diǎn),點(diǎn)E在直線BC上(點(diǎn)E不與點(diǎn)B,C重合),連接DE,過點(diǎn)D作DF⊥DE交直線AC于點(diǎn)F,連接EF.
(1)如圖1,當(dāng)點(diǎn)F與點(diǎn)A重合時(shí),請(qǐng)直接寫出線段EF與BE的數(shù)量關(guān)系;
(2)如圖2,當(dāng)點(diǎn)F不與點(diǎn)A重合時(shí),請(qǐng)寫出線段AF,EF,BE之間的數(shù)量關(guān)系,并說明理由;
(3)若AC=5,BC=3,EC=1,請(qǐng)直接寫出線段AF的長(zhǎng).