若△ABC∽△DEF,且∠A=∠E,AB=DF=6,BC=5,AC=4,则DE=_.

问题描述:

若△ABC∽△DEF,且∠A=∠E,AB=DF=6,BC=5,AC=4,则DE=______.

由△ABC∽△DEF,且∠A=∠E,AB=DF=6,BC=5,AC=4,

BC
DF
=
AB
DE
BC
DF
=
AC
DE

代入得:DE=
24
5
36
5

故答案为:
24
5
36
5