3*(1/5)=3/5; 3*(1/4)=3/4; 3*(1/8)=3/8.
po odnu pyatuyu trexkilogramovii perog odnaporcia sostavlyaet a)200gram etot pirog sostav 15porcii b)odna porcia 250 gramm 12porcii v)125gramm sostav pirog 24 porcii
