Răspuns:
Explicație pas cu pas:
[tex]\frac{3}{4}[/tex] a = [tex]\frac{2}{3}[/tex] b => 3*3 a = 2*4 b => 9a=8b => a= [tex]\frac{8}{9}[/tex] b
[tex]\frac{x}{18}[/tex] b = [tex]\frac{4}{5}[/tex] a => [tex]\frac{x}{18}[/tex] b = [tex]\frac{4}{5}[/tex] * [tex]\frac{8}{9}[/tex] b => [tex]\frac{x}{18}[/tex] = [tex]\frac{32}{45}[/tex] => x = 18*32 / 45 => x = 64/5