a=[1/3+1/9]:2/3 amplificãm pe 1/3 cu 3
a=[3/9+1/9]:2/3=4/9×3/2=2/3
b=5/6:21/9×[1+1/2×1/3] amplificãm pe 1 cu 6
b=5/6×9/21×[6/6+1/6]=15/42×7/6=5/12
c=1/3-{1/3-[1/3-3/2×(1/3-1/4)]} amplificãm pe 1/3 cu 4 si pe 1/4 cu 3
c=1/3-{1/3-[1/3-3/2×7/12]}=1/3-{1/3-[1/3-7/8]} amplificãm pe 1/3 cu 8 si pe 7/8 cu 3
c=1/3-{1/3-[8/24-21/24]}=1/3-{1/3+13/24} amplificãm pe ambele 1/3 cu 8
8/24-{8/24+13/24}=8/24-21/24= -13/24
ordinea este c, b, a
