题目如图,AD=CBAD=CBAD=CB,AB=CDAB=CDAB=CD,BE⊥ACBE\bot ACBE⊥AC于点EEE,DF⊥ACDF\bot ACDF⊥AC于点FFF.(1)(1)(1)求证:ABABAB∥DCDCDC；(2)(2)(2)求证:BE=DFBE=DFBE=DF.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,,,于点,于点.如图,,,于点,于点.如图,,,于点,于点.