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Ответ

Ответ дан
alinamialik0409

Ответ:

12

Пошаговое объяснение:

т.к если Алена сшила 4/7 а Наташа 21 то получается действие 4/7*21/1 21и7 сокращаются остаются 4 и 3

4*3=12

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