6 7/8-3 1/3+5 5/16=6 42/48-3 16/48+5 15/48=8 41/48;
2) 5 8/15+4 7/12-3 19/20=5 32/60+4 35/60-3 57/60=6 10/60=6 1/6; 3)(36 2/3+3 1/8)-(18-10 5/9)=(36 16/24+3 3/24)-(17 18/18-10 10/18)=39 19/24-7 8/18=39 57/72-7 32/72=32 25/72; 4)20 7/18-(15 5/6-9 25/27)=20 7/18-(15 45/54-9 50/54)=20 7/18-(14 99/54-9 50/54)=20 7/18-5 49/54=20 21/54-5 49/54=19 75/54-5 49/54=14 26/54; 5)5 9/14-2 3/7+6,7=5 9/14-2 6/14+6 7/10= 3 3/14+6 7/10=3 30/140+6 98/140=9 128/140;