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∵ED‖BC,EF‖AC,∴四邊形EFCD為平行四邊形,∴ED=CF,∵BD平分∠ABC,∴∠EBD=∠FBD,又ED‖BC,∴∠EDB=∠FBD,∴∠EBD=∠EDB,∴EB=ED,∴EB=CF.
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