Răspuns:
12/91•(1/3+1:2/7:7/6)+6/13•(1/4+11/72:7/6)=
12/91•(1/3+7/2•6/7)+6/13•(1/4+11/72•6/7)=
12/91•(1/3 + 3)+6/13•(1/4 + 11/84)=
12/91•10/3 + 6/13•32/84 =
40/91 + 32/182 =
40/91 + 16/91 =
56/91
