∵△ABC沿EF折叠B和B′重合,
∴BF=B′F,
设BF=x,则CF=8-x,
∵当△B′FC ∽ △ABC,
∴
B ′ F
AB =
CF
BC ,
∵AB=6,BC=8,
∴
x
6 =
8-x
8 ,
解得:x=
24
7 ,
即:BF=
24
7 ,
当△FB′C ∽ △ABC,
FB′
AB =
FC
AC ,
x
6 =
8-x
6 ,
解得:x=4,
当△ABC ∽ △CBF′时,同法可求BF=4,
故BF=4或
24
7 ,
故选:D.
∵△ABC沿EF折叠B和B′重合,
∴BF=B′F,
设BF=x,则CF=8-x,
∵当△B′FC ∽ △ABC,
∴
B ′ F
AB =
CF
BC ,
∵AB=6,BC=8,
∴
x
6 =
8-x
8 ,
解得:x=
24
7 ,
即:BF=
24
7 ,
当△FB′C ∽ △ABC,
FB′
AB =
FC
AC ,
x
6 =
8-x
6 ,
解得:x=4,
当△ABC ∽ △CBF′时,同法可求BF=4,
故BF=4或
24
7 ,
故选:D.