1/2-7/2
1/3+2/3+/4/3
1/2+1/2=
2/5(2/3)
1/2(2/5)
1/2+2/3+4/5=
4/5+1/5+6/5
2/3-1/4
(2/3)/(1/2)
1/2+2/3
4/15
5/12
1/5
59/30
7/3
7/6
4/3
1
11/5
-6/2
