Вопрос школьника по предмету Математика
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. Решите уравнение:
а) 8у = –62,4 + 5у; б) .
2. В одной бочке в 3 раза больше бензина, чем в другой.
Если из первой бочки отлить 78 л бензина, а во вторую добавить 42 л, то бензина в бочках будет поровну.
Сколько бензина в каждой бочке?
3. Найдите корень уравнения .
4. Скорость автобуса на 26 км/ч меньше скорости легкового автомобиля. Автобус за 5 ч проходит такой же путь, как легковой автомобиль за 3 ч. Найдите скорость автобуса.
5. Найдите два корня уравнения | –0,42 | = | у | | –2,8 |.
Ответ учителя по предмету Математика
2) Пусть Х — во второй бочке, тогда 3Х — в первой. Так как после отливов стало поровну в каждой, то 3Х-78=Х+42, отсюда 2Х=120, Х=60, значит во второй бочке 60 литров. В третьей — 60*3=180 литров
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