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Ответ дан
Peach127

б) t1=П/3   t2=-П-П/3=-4П/3

-4П/3 +2Пн < 3x-П/6 < П/3 +2П/н

-4П/3 + П/6 + 2Пн < 3х < П/3 + П/6 + 2Пн

-7П/6 +2Пн < 3х < П/2 +2Пн     все части неравенства делишь на 3

-7П/18 +2П/3 н < х < П/6 +2П/3 н

Ответ: (-7П/6 +2П/3 н; П/6 + 2П/3 н)

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