(1)证明:∵在△ABE和△DCE中 ∠A=∠D ∠AEB=∠DEC AB=DC ∴△ABE≌△DCE(AAS);(2)解:∵△ABE≌△DCE,∴BE=EC,∴∠EBC=∠ECB,∵∠EBC+∠ECB=∠AEB=50°,∴∠EBC=25°.