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Ответ дан
Galina1013

Ответ:


Пошаговое объяснение:

1)  20/85=4/17

2) 3/7=9/21=15/35=6/14

Ответ

Ответ дан
katrusya777
20/85=(2*2*5)/(5*17)=4/17

3/7=6/14=9/21=12/28=15/35

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