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Консультация № 185142
11.01.2012, 12:00
62.66 руб.
0
6
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Обсуждение
11.01.2012, 16:28
общий
это ответ
Здравствуйте, Посетитель - 376401!
Имеем
[$8747$]te-t^2dt = (-1/2)[$8747$]e-t^2d(-t2) = (-1/2)e-t^2 + C.
Тогда
f1(x) = -∞∫+∞f(x, y)dy = 0∫+∞36xye-(x^2 + y^2)dy = 36xe-x^20∫+∞ye-y^2dy =
= 36xe-x^20∫+∞(-1/2)(-2y)e-y^2dy = -18xe-x^2(e-y^2)|0+∞ = 18xe-x^2 (x > 0), иначе f1(x) = 0;
f1(y) = -∞∫+∞f(x, y)dx = 18ye-y^2 (y > 0), иначе f2(y) = 0.
С уважением.
Имеем
[$8747$]te-t^2dt = (-1/2)[$8747$]e-t^2d(-t2) = (-1/2)e-t^2 + C.
Тогда
f1(x) = -∞∫+∞f(x, y)dy = 0∫+∞36xye-(x^2 + y^2)dy = 36xe-x^20∫+∞ye-y^2dy =
= 36xe-x^20∫+∞(-1/2)(-2y)e-y^2dy = -18xe-x^2(e-y^2)|0+∞ = 18xe-x^2 (x > 0), иначе f1(x) = 0;
f1(y) = -∞∫+∞f(x, y)dx = 18ye-y^2 (y > 0), иначе f2(y) = 0.
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
Неизвестный
12.01.2012, 09:30
общий
Адресаты:
Огромное спасибо за оперативность.
Немогли бы дать пояснения к решению?
Немогли бы дать пояснения к решению?
Неизвестный
12.01.2012, 10:49
общий
12.01.2012, 11:05
Адресаты:
Формулы следствие какого закона? Свойства? Почему именно они? И как выглядят в исходном виде ?
В идеале примерно так:
/Имеем (задание), необходимо (вопрос),значит (используем то и то, потому что (так и так)), делаем действие (то и это), отсюда следует (это и это)/
В общем как ответ на вопрос 185151
Хотелось бы разобраться. Спасибо за понимание.
В идеале примерно так:
/Имеем (задание), необходимо (вопрос),значит (используем то и то, потому что (так и так)), делаем действие (то и это), отсюда следует (это и это)/
В общем как ответ на вопрос 185151
Хотелось бы разобраться. Спасибо за понимание.
12.01.2012, 11:10
общий
Предлагаю Вам прочитать хотя бы этот теоретический материал. И ещё. Решение задач по любой дисциплине не предполагает изложения теоретических основ решения, кроме исключительных случаев, когда требуется вывод какого-нибудь следствия из установленных законов. Априори предполагается, что автор решения с ними знаком. Своим вопросом
Формулы следствие какого закона? Свойства? Почему именно они? И как выглядят в исходном виде ?
Вы поставите впросак любого эксперта. Отвечать на вопрос в Вашей постановке - значит заменить Вам учебник.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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