题目如图,在△ABC\triangle ABC△ABC中,点DDD是ACACAC边上一点,将△ABD\triangle ABD△ABD沿BDBDBD翻折得到△EBD\triangle EBD△EBD,BEBEBE与ACACAC交于点FFF,设AF=xAF=xAF=x,EF=yEF=yEF=y.(1)(1)(1)当BE⊥ACBE\bot ACBE⊥AC,x=9x=9x=9,y=3y=3y=3时,ADADAD的长是______;(2)(2)(2)当BD=BFBD=BFBD=BF,2x=7y2x=7y2x=7y时,△DEF\triangle DEF△DEF与△ABD\triangle ABD△ABD的面积之比是______.知识点:轴对称变换章节:图形的变化 / 图形的旋转