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7)

7/6 = 14/12 = 21/18

20/8 = 10/4 = 40/16

11/5 = 22/10 = 33/15

8)

1,2/3,5 = 12/35

1,3/22 = 13/220

0,45/1,2 = 45/120

0,004/11 = 4/11 000

9)

20/30 = 2/3

18/54 = 1/3

75/50 = 3/2

120/84 = 10/7.

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