1.преобразование уравнения должно быть...(13 букв, вторая о,пятая е, девятая е, одиннадцатое о,тринадцатая е) 2.Чтобы число не являлось корнем уравнения, нужно чтобы при его подстановке равенство было...(4 буквы, вторая о) P.S это сканворд
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Весь путь автомобиля примем за единицу (целое).
1) 1 - 5/12 = 12/12 - 5/12 = 7/12 - оставшаяся часть пути;
2) 15/28 · 7/12 = (5·1)/(4·4) = 5/16 - часть пути, пройденного за второй час;
3) 7/12 - 5/16 = 28/48 - 15/48 = 13/48 - часть пути, пройденного за третий час;
4) 5/12 - 13/48 = 20/48 - 13/48 = 7/48 - разница, равная 42 км;
5) 42 : 7/48 = 42 · 48/7 = 6 · 48 = 288 (км) - весь путь автомобиля.
ответ: 288 км.
Проверка:
1) 5/12 · 288 = 120 км - пройдено за 1-й час;
2) 15/28 · (288 - 120) = 90 км - пройдено за 2-й час;
3) 13/48 · 288 = 78 км - пройдено за 3-й час;
4) 120 - 78 = 42 км - на столько меньше пройдено за 3-й час.