(1),BD=DE,DF垂直于BE--->EF=FB
BE/BD=BC/AB=6/5,BF/BD=3/5
BD^2=BF^2+DF^2,DF/BD=4/5
DC=DF,(1+4/5)BD=6,BD=10/3
(2),设BD=x,AE=y,y=5-6x/5,0
(1),BD=DE,DF垂直于BE--->EF=FB
BE/BD=BC/AB=6/5,BF/BD=3/5
BD^2=BF^2+DF^2,DF/BD=4/5
DC=DF,(1+4/5)BD=6,BD=10/3
(2),设BD=x,AE=y,y=5-6x/5,0