Răspuns:
Explicație pas cu pas:
3.
3/4 = 6/8
12/15 = 4/5
2/3 = 8/12
5/6 = 20/24
1/2 = 8/16
1/3 = 7/21
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5.
2/5 = 6/15
15/10 ≠ 5/3
3/5 ≠ 9/20
30/40 = 6/8
2/7 ≠ 70/20
33/22 = 3/2
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7.
8/22 = 4/11
21/18 = 7/6
9/18 = 1/2
5/40 = 1/8
8/12 = 2/3
10/6 = 5/3
12/16 = 3/4
18/6 = 3/1
10/25 = 2/5