证明:∵∠ABE + ∠EBC = 60° ,∠CBD + ∠EBC = 60° ∴∠ABE = ∠CBD
BE = BD,AB = BC,∠ABE = ∠CBD,则△ABE全等于△CBD
AE = CD ,∴ AD = AC + CD = AC + AE
证明:∵∠ABE + ∠EBC = 60° ,∠CBD + ∠EBC = 60° ∴∠ABE = ∠CBD
BE = BD,AB = BC,∠ABE = ∠CBD,则△ABE全等于△CBD
AE = CD ,∴ AD = AC + CD = AC + AE