如图,在△ABC和△ADE中,AB/AD=BC/DE=AC/AE,点B、D、E在一条直线上,求证:△ABD∽△ACE.

问题描述:

如图,在△ABC和△ADE中,

AB
AD
=
BC
DE
=
AC
AE
,点B、D、E在一条直线上,求证:△ABD∽△ACE.

证明:∵在△ABC和△ADE中,

AB
AD
=
BC
DE
=
AC
AE

∴△ABC∽△ADE,
∴∠BAC=∠DAE,
∴∠BAD=∠CAE,
AB
AD
AC
AE

AB
AC
AD
AE

∴△ABD∽△ACE.