4 11/48*6/7-1 4/9=203/48*6/7-13/9=29/8-13/9=261/72-104/72=157/72=2 13/72
(2/3+5/8-11/12)*5 1/3=(8/12+5/8-11/12)*16/3=(-3/12+5/8)*16/3=(-6/24+15/24)*16/3=9/24-16/3=9/24-128/24=-119/24=-4 23/24
15 4/7-4 3/8*(1 3/7-34/35)=109/7-35/8*(10/7-34/35)=109/7-35/8*(50/35-34/35)=109/7-35/8*16/35=109/7-2=109/7-14/7=95/7=13 4/7