题目如图,已知∠AEF=∠DEC\angle AEF=\angle DEC∠AEF=∠DEC,AE=DEAE=DEAE=DE,∠C=∠F\angle C=\angle F∠C=∠F,求证:△AEC\triangle AEC△AEC≌△DEF.\triangle DEF.△DEF.知识点：相似三角形的判定I章节：图形的变化 / 图形的相似
如图,已知,,,求证:≌如图,已知,,,求证:≌如图,已知,,,求证:≌