Lubov х: 3/7=х·7/3=21/31 х=21/31:7/3=21/31·3/7 = 21·3/(31·7) = 3·3/31=9/31 z:3 1/3 = z : 10/3 = z·3/10 = 0,3z = 1 9/10=1,9 0,3z=1,9 z=1,9/0,3=19/3=(18+1)/3=18/3 + 1/3 = 6+1/3=6 1/3