Автор - DjБемби

4/9:2 5/7:3 10/21:5 9/10:15 3/7:21

Ответ

Автор - jekadva
4/9:2=4/9*1/2=2/9 
5/7:3=5/7*1/3=5/21
10/21:5 =10/21*1/5=2/21
9/10:15 =9/15*1/15=3/75=1/25
3/7:21=3/7*1/21=1/49

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