Пошаговое объяснение:
[tex] \frac{1}{60} + \frac{1}{20} = \frac{1}{60} + \frac{3}{60} = \frac{1 + 3}{60} = \frac{4}{60} = \frac{1}{15} [/tex]
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Пошаговое объяснение:
[tex] \frac{1}{60} + \frac{1}{20} = \frac{1}{60} + \frac{3}{60} = \frac{1 + 3}{60} = \frac{4}{60} = \frac{1}{15} [/tex]