EF/AB=FD/AD
EF/CD=AF/AD
EF=FD*AB/AD=AF*CD/AD
FD*AB=AF*CD
FD=AF*CD/AB
EF/AB=FD/AD=(AF*CD/AB)/AF(1+CD/AB)=(CD/AB)/(1+CD/AB)=1+AB/CD=5/3
Ответ: 5/3
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EF/AB=FD/AD
EF/CD=AF/AD
EF=FD*AB/AD=AF*CD/AD
FD*AB=AF*CD
FD=AF*CD/AB
EF/AB=FD/AD=(AF*CD/AB)/AF(1+CD/AB)=(CD/AB)/(1+CD/AB)=1+AB/CD=5/3
Ответ: 5/3