1 31/35:(2-8/9:1 19/45)=66/35:(2-8/9:64/45)=66/35:(2-8/9*45/64)=
=66/35:(2-1/1*5/8)=66/35:(2-5/8)=66/35:1 3/8=66/35:11/8=66/35*8/11=6/35*8/1=
=48/35=1 13/35
(7-1 5/9:7/24):20/27=(7-14/9:7/24)*27/20=(7-14/9*24/7)*27/20=
=(7-2/3*8/1)*27/20=(7-16/3)*27/20=(7-5 1/3)*27/20=1 2/3*27/20=
=5/3*27/20=1/1*9/4=9/4=2 1/4=2,25