1) 12/13-8/13= 4/13
2) 8/9-2/9=2/3
3) 14/15-10= -9又1/15
4) 11/13-7/13=4/13
5) 8/10-1/10= 7/10
6) 13/14-7/14=3/7
7) 5/9 1/9=4/9
8) 5/13-4 =-3又8/13
6/5-4/2=3/2-2/1=4/1+3/2=
5/3-3/1= 8/4-6/1= 3/5-4/3=
6/2+3/1=9/5-2/1=7/2+3/1=
5/2-6/2=4/2+2/1= 8/3-5/1=
9/3-3/1=12/7-8/3=5/2+3/1=
1-9/4=9/5+9/8= 8/1+8/7=
24/19-24/13=36/19+36/3=
7/3+7/4=8/11-8/1=4/1-9/1=
13/12-13/3=9/8-9/1=1-6/1=
4/3+4/1=8/7-8/3=9/2+8/3=
7/2+2/1=6/2-7/1=3/2-4/1=
8/2-13/2=5/1+7/1=3/1+2/1=
4/1+2/1=2/1-5/1=7/5+8/1=
5/2-3/1=6/1+5/2=9/5+8/1=
4/1-6/1=5/2+7/1=6/1+2/1=
9/2-12/3=3/2+8/1=5/2-3/1=
3/1-4/1= 9/2+2/1= 2/1+8/4=
1/4+1/8=2/3-1/6=3/7+5/14=
2/5-2/15=7/8-9/16=1/32+1/4=
2/9+7/9=3/4-9/16=25/32-3/8=
3/5+13/15=23/25+1/5=
21/25-1/5=
3/14+2/7=
2/3+1/9=
5/7-3/14=
7/9+1/18=
19/21+3/7=
23/35-1/5=
3/4+1/16=
3/8-1/16=
5/9+4/9=
8/17-7/17=
1) 12/13-8/13= 2) 8/9-2/9= 3) 14/15-10= 4) 11/13-7/13= 5) 8/10-1/10= 6) 13/14-7/14= 7) 5/9 1/9= 8) 5/13-4
