1: 3/2 3/5 1
1/8 3/4 3/10
2: 5/9+x=5/6
x=5/6--5/9
x=15/18--10/18
x=5/18
x+1/8=3/4
x=3/4--1/8
x=6/8--1/8
x=5/8
x--3/8=5/8
x=5/8+3/8
x=1
3: 1/6+5/6
--1/9+2/9
4: 4/7+1/6--4/7
=4/7--4/7+1/6
=1/6
2--7/9--2/9
=2--﹙7/9+2/9﹚
=2--1
=1
1/4+﹙2/5+3/4﹚
=1/4+3/4+2/5
=1+2/5
=7/5
3/5+7/8+2/5
=3/5+2/3+7/8
=1+7/8
=15/8
7/9--﹙1/9+1/3﹚
=7/9--1/9--1/3
=2/3--1/3
=1/3
5/6--3/10+1/6--7/10
=﹙5/6+1/6﹚--﹙3/10+7/10﹚
=1--1
=0
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