Предмет: Алгебра, автор: alexander200541

Скажите пожалуйста сколько будет одна двадцать первая плюс одна двадцать восьмая

Ответы

Автор ответа: mmb1

28 = 4*7

21 = 3*7

1/21 + 1/28 = 1/7*(1/3 + 1/4) = 1/7*(3+4)/12 = 1/12

Автор ответа: Amigo3

Ответ: 1/21+1/28=(1*4+1*3)/84=7/84=1/12

Объяснение:

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