Question

А7
Пожалуйста !!!!!!!!!!!!

Answer 1

3) 3$l_{2}$

$F_{1} × l_{1} = F_{2} × l_{2} - textgreater frac{F_{2}}{2} × l_{1} = F_{2} × l_{2} = textgreater frac{l_{1}}{2} = l_{2} - textgreater l_{1}= 2 × l_{2},$, L= $l_{1} + l_{2} = textgreater L= 3l_{2}$