Question

angle bed= angle bde and e is the middle point of bc . prove that ac/cf=ad/be

Answer 1

See diagram...  There is  mistake in the given problem.
 It is to be proved that AF/ CF = AD / BE..

Let ∠BDE = ∠BED = x°.   Hence, in ΔBDE, we have BD = BE = BC/2.

Now Draw CG parallel to AB.   
∠CEG = x°  (vertical angle). 

 ΔBED and Δ CEG are similar as   CE || BE, CG || BD, EG || ED.
Since BE = EC, They are congruent.  Hence, ∠CEG = ∠CGE = x°   and 
∠ECG = ∠B.

Now for the ΔABC, ∠FCB is external angle =>    ∠FCB = ∠A+∠B
Hence,   ∠GCF = ∠A.
Further, ∠CGF = 180° - ∠CGE = 180° - x°.

In ΔCGF , ∠F = 180° - ∠A - (180° - x°) = x° - ∠A

Now compare ΔADF  and  Δ CGF:  Since all corresponding angles are same they are similar triangles.

=>  AF/AD = CF/CG = CF / CE = CF / BE
=>  AF / CF = AD / BE

Proved.