7. b) Daca [tex] \frac{x}{y} [/tex]=[tex] \frac{3}{5} [/tex] ,[tex] y\neq 0[/tex] ,atunci [tex] \frac{4x+6y}{x+y} [/tex]= ?
c)Daca [tex] \frac{x}{4} [/tex]=[tex] \frac{y}{7} [/tex], atunci [tex] \frac{9x-2y}{x+3y} =[/tex] ??
d)Daca [tex] \frac{x}{2} = \frac{y}{9} ,atunci \frac{10x - 2y}{5x + y} = ?[/tex]