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Здравствуйте! У меня возникли сложности с таким вопросом: 1) Задана функция y=f(x) и два значения аргумента х1 и х2. Требуется: 1) установить, является ли данная функция непрерывной или разрывной для каждого из данных значений аргумента; 2) в случае разрыва функции найти её пределы слева и справа; 3 )сделать схематический чертёж. f(x)= 2^(1/(x-5)) (эф от икс равно 2 в степени: 1, делённое на (х-5) ); х1 = 3, х2 = 5. 2) Задана функция y=f(x). Найти точки разрыва, если они существуют. Сделать схематический чертёж. | x^2+1, x<=1, (икс в квадрате плюс один, икс меньше или равно 1) f(x) = |2x, 1<x<=3, |x+2, x>3
P.S. Сама суть заданий мне понятна. Но т.к. высшую математику изучал давно, берут некоторые сомнения. Мне бы главное пояснения к этим заданиям.
Во втором задании - кусочная функция, сбились обозначения.
Неизвестный
05.11.2011, 10:43
общий
07.11.2011, 15:15
f(x)=2^(1/x-5) Для значения x1=3, f(3)=2^(1/3-5)=1/2^(1/2). x2=5, f(5)=2^(1/5-5)=2^(1/0). В точке x=5 разрыв: функции не существует.
Код:
|x^2+1, x<=1, (икс в квадрате плюс один, икс меньше или равно 1) f(x) = |2x, 1<x<=3, |x+2, x>3
Схематичный чертеж:
По чертежу видно что точек разрыва нет.
Неизвестный
05.11.2011, 10:48
общий
Вот изображения, там почему-то не отображаются. http://u.to/hm1IAQ http://u.to/o21IAQ
Неизвестный
05.11.2011, 11:33
общий
05.11.2011, 15:47
это ответ
Здравствуйте, Aleksandrkib! Задание № 1. 1) Для х = 3 функция непрерывна и имеет конечный предел , для х = 5 функция имеет разрыв и неопределенность. 2) Слева функция стремится к нуля, справа к бесконечности.
Задание № 2 Для функции, заданной в задаче, разрывом является точка х = 3, поскольку слева ее значение равно 6, а справа принимается значение 5. (Точка х =1 разрывом не является, поскольку слева и справа имеет функция равна 2).
Будьте, пожалуйста, аккуратнее. Ведь нехорошо написано:
А это ещё хуже:
Кроме того, на графиках функций следует указывать, принадлежит та или иная точка ему или не принадлежит. На первом графике у Вас не установлена принадлежность графику точки с абсциссой x = 5 (на оси абсцисс эта точка должна быть помечена кружком - быть "выколотой" и/или левая ветвь графика функции должна заканчиваться стрелкой с концом в точке с абсциссой x = 5). На втором графике в точке с абсциссой x = 3 у Вас изображён отнюдь не разрыв. И тоже не показана правильно принадлежность точек графику функции.
В принципе, всё это - почти что мелкие погрешности. Но для ответа на платный вопрос качество его оставляет желать лучшего.
Большое спасибо всем экспертам за ответы! Разобрался в решении; описано всё доходчиво и понятно, нежели в учебниках по высшей математике. Мне это и было нужно.
Здравствуйте, Марк. Размещайте изображения на нашем портале (ссылка "мои файлы" на главной странице) Как это не видно? Еще как видно! x=3 - самый натуральный разрыв первого рода Посмотрите чертежи Орловского Дмитрия.
Об авторе:
"Если вы заметили, что вы на стороне большинства, — это верный признак того, что пора меняться." Марк Твен
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