2/7+1/6=
7/15-1/15=
2/9+7/18=
14\21-4/7=
4/15+1/3=
2/3-1/9=
4/5+6/25=
11/12-1/12 =
1/2+2/7=
13/15-2/3=
3/8+1/3=
4/5-1/10=
1/9+2/9=
5/24-1/6=
12/19+7/19

2\7+1\6=19/427\15-1\15=6\152/9+7/18= 11\1814\21-4/7= 2\214/15+1/3= 9\152/3-1/9=5\94/5+6/25= 1 1\2511/12-1/12 =10\121/2+2/7= 11\1413/15-2/3=10\153/8+1/3= 17\244/5-1/10= 7\101/9+2/9= 3\95/24-1/6=1\2412/19+7/19 = 1