1.
1/5 = 3/15
1/3 = 5/15
2/7 = 4/14
1/2 = 8/16
5/8 = 15/24
1/6 = 10/60
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a)
1/2 = 35/70
3/7 = 10/70
4/5 = 56/70
9/14 = 45/70
b)
1/2 = 70/140
3/7 = 60/140
4/5 = 112/140
9/14 = 90/140
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3/6 = 1/2
2/4 = 1/2
9/15 = 3/5
12/20 = 6/10
10/12 = 5/6
4/10 = 2/5
8/24 = 1/3
10/20 = 1/2