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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: В цехе имелось n одинаковых станков, которые, работая вместе, вытачивали в день 5850 деталей. После реконструкции число производимых в день каждым станком деталей возросло на 20%. Это позволило по крайней мере без сокращения общего объема продукции цеха уменьшить число станков максимум на 4. Найти n.
Здравствуйте, kinskue! Производительность одного станка обозначим р. p*n=5850 (1) 1,2p*(n-4)=5850 (2) Решаем систему из двух уравнений. Из ур-я (1) p=5850/n - подставим в (2) (1,2*5850/n)*(n-4)=5850 7020-28080/n = 5850 28080/n = 1170 n=24
3
Для решения задачи необходимо составлять неравенства.
С неравенствами особых изменений нет 1,2(n-4)[$8805$]n 0,2n[$8805$]4,8 n[$8805$]24
Однако, здесь есть интересный нюанс При n=24 производительность каждого станка до реконструции равна 5850/24=243,75 деталей. А с практической точки зрения 4 станка закончивших последнюю деталь на 3/4 не равняются трём готовым деталям на конец дня.
Если предположить, что производительность одного станка в день должна быть целым числом, то это условие для исходной производительности выполняется при n=25 (234 детали), но после повышения производительности на 20% опять получаем дробь. И только при n=26 мы получаем целую производительность одного станка как до (225 деталей), так и после реконструкции (270 деталей)
Здравствуйте, kinskue! Условие "без сокращения общего объема продукции цеха уменьшить число станков [size=1]<...>[/size] на 4" даёт следующее неравенство 1,2(n-4)[$8805$]n 0,2n[$8805$]4,8 n[$8805$]24
Впрочем, у этого условия есть и обратная сторона, а именно " уменьшить число станков максимум на 4" - то есть, если убрать 5 станков, то производительность упадёт 1,2(n-5)<n 0,2n<6 n<30
Итого, из этого условия получаем целые числа от 24 до 29 включительно.
Однако, здесь есть интересный нюанс При n=24 производительность каждого станка до реконструции равна 5850/24=243,75 деталей. А с практической точки зрения 4 станка закончивших последнюю деталь на 3/4 не равняются трём готовым деталям на конец дня.
Если предположить, что производительность одного станка в день должна быть целым числом, то это условие для исходной производительности выполняется при n=25 (234 детали), но после повышения производительности на 20% опять получаем дробь.
И только при n=26 мы получаем целую производительность одного станка как до (225 деталей), так и после реконструкции (270 деталей).
Значения n от 27 до 29 также дают дробную производительность.
В итоге, единственное значение n, соответствующее условию и дающее целую производительность - это n=26
5
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