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3. Решите задачу: Из лука вертикально вверх выпустили стрелу. Расстояние h (в метрах) стрелы от поверхности земли можно найти по формуле h=-t2+7t+18   

Какой наибольшей высоты достигнет стрела?

Через сколько секунд после выстрела стрела упадет на землю? 

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