5 5/9(*6)+3 1/6(*9)- 6 4/27(*2)=5 30/54+3 9/54-6 8/54=2 31/54 12 13/48-(9 17/32-4 5/24)=7 91/96 1)9 17/32(*3)-4 5/24(*4)=9 51/96- 4 20/96=5 31/96 2)12 13/48(*2)-5 31/96=12 26/96-5 31/96=11 218/96-5 31/96=6 187/96= =7 91/96 1 5/7(*4)+3 11/14(*2)-2 1/4(*7)=1 20/28+3 22/28-2 7/28=2 37/28 (18-10 18/35)-(3 9/28+2 3/20)=3 3/70 1)18-10 18/35=8 18/35 2)3 9/28(*5)+2 3/20(*7)=3 45/140+2 21/140=5 66/140 3)8 18/35(*4)-5 66/140=8 72/140-5 66/140=3 6/140=3 3/70