∵∠FBE=∠EBC
∠FEB=∠CEB
BE=BE
∴△BEF≌△BEC
∴EF=EC
∴2CE=FC
又∵∠BAD=∠CED
∠ADB=∠EDC
∴∠ABD=∠ACF
又∵BA=CA
∠BAD=∠CAF
∠ABD=∠ACF
∴△ABD=△ACF
∴BD=CF
∴BD=2CE
∵∠FBE=∠EBC
∠FEB=∠CEB
BE=BE
∴△BEF≌△BEC
∴EF=EC
∴2CE=FC
又∵∠BAD=∠CED
∠ADB=∠EDC
∴∠ABD=∠ACF
又∵BA=CA
∠BAD=∠CAF
∠ABD=∠ACF
∴△ABD=△ACF
∴BD=CF
∴BD=2CE