连接DC．∵等边三角形ABC,∴AB=BC=AC,∵AB=BF,∴BF=AB=BC,在△FBD和△CBD中 BF=BC∠1=∠2BD=BD,∴△FBD≌△CBD,∴∠BFD=∠BCD,在△ACD和△BCD中 AC=BCCD=CDBD=AD,∴△ACD≌△BCD,∴∠ACD=∠BCD∵∠C...