а)13 3/7-5 6/7=12 7/7+3/7-5 6/7=12 10/7-5 6/7=7 4/7;
б) 7 5/13-2 8/13=6 13/13+5/13-2 8/13=6 18/13-2 8/13=
4 10/13;
в) 5 7/19-4 16/19=5 19/19+7/19-4 16/19=5 26/19-4 16/19=1 10/19;
г) 9 5/16-5 9/16=816/16+5/16-5 9/16=8 21/16-5 9/16=
3 12/16=3 3/4;
д)8 8/25-7 18\25=7 25/25+8/25-7 18/25=7 33/25-
7 18/25=15/25=3/5;
е)4 5/16-1 3/8=4 5/16-1 6/16=3 16/16+5/16-1 6/16=
3 21/16-1 6/16=2 15/16;
ж)8 6/25-3 4/5=7 25/25+6/25-3 20/25=7 31/25-3 20/25
=4 11/25;
12 2/15-2=10 2/15