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Этому условию удовлетворяют точки, расположенные на прямых y = x - 1 и y = x + 1 и между ними.
На множестве действительных чисел выражение
определено при значениях переменных x и y, имеющих один знак, то есть при x [$8805$] 0, y [$8805$] 0 (первая четверть координатной плоскости Oxy) и x [$8804$] 0, y [$8804$] 0 (третья четверть коодинатной плоскости), а выражение
находится в знаменателе выражения для функции и поэтому функция не определена при x = y = 0 (начало координат). Следовательно, областью определения функции
является объединение первой и третьей четвертей координатной плоскости Oxy, исключая начало координат.
С уважением.
Об авторе:
Facta loquuntur.
Неизвестный
02.05.2011, 15:45
общий
03.05.2011, 08:36
это ответ
Здравствуйте, Ольга Никанова! 2) Область определения функции z=arcsin(x-y) есть множество точек плоскости, удовлетворяющих неравенству -1[$8804$]x-y[$8804$]1 или x-1[$8804$]y[$8804$]1+x. Получаем множество точек (x;y), находящихся между прямыми y=x-1 и y=x+1 вместе с точками, принадлежащие прямым (рис.1) Область определения функции z=[$8730$](xy)/(x2+y2) есть множество точек плоскости, удовлетворяющих неравенству xy[$8805$]0 и кроме точки (0;0) - в точке знаменатель обращается в ноль. Решением неравенства является множество точек лежащих как показано на рисунке 2
Рисунок 2 неверен. В мини-форуме автор ответа, исправляя ошибку, сообщает
3) В данном случае F(x,y,z)=x2+y2+z2-xy-2, поэтому F'x=2x-y, F'y=2y-x, F'z=2z Следовательно, z'x=-F'x/F'z=-(2x-y)/(2z), z'y=-F'y/F'z=-(2y-x)/(2z). Вычисляем значения частных производных в точке М0(-1;0;1), получим z'x(-1,0,1)=-(2*(-1)-0)/(2*1)=1, z'y(-1,0,1)=-(2*0+1)/(2*1)=-0.5
Неизвестный
02.05.2011, 16:25
общий
Я как то не подрасчитала, что ответить можно только раз! А сколько максимум символов в один ответ может поместится?
Если Вы хотите дополнить ответ, то можете сделать это в мини-форуме. Но посмотрите, пожалуйста, ещё раз свой ответ на вторую часть второго задания вопроса. Мне кажется, что не всё правильно.
Здравствуйте, Ольга Никанова! 5) Вычисляем первые производные zx=3x2-6y zy=24y2-6x
Находим стационарные точки, приравнивая производные к нулю x2=2y 4y2=x Подставляя x из второго уравнения в первое, получим 16y2=2y ----> y=0 (x=0); y=1/2 (x=1) Таким образом, имеем две стационарные точки: A(0;0) и B(1;1/2).
Исследуем стационарные точки на экстремум. Находим вторые производные zxx=6x zxy=-6 zyy=48y
a) A(0;0) zxx*zyy-zxy2=-36<0 Это условие является достаточным для отсутствия экстемума.
б) B(1;1/2) zxx=6>0 zxx*zyy-zxy2=108>0 Это условие является достаточным наличия минимума.
Непонятно, какое отношение имеет гипербола к рассматриваемой функции. Посмотрите на условие задачи.
Об авторе:
Facta loquuntur.
Неизвестный
03.05.2011, 01:22
общий
Задание 5: Подскажите, почему при А(0, 0) дискриминант равен -9, а не -36? И также при В(1, 1/2) дискриминант равен 135, ведь 6*24-(-6)^2=144-36=108. Или я не правильно вычисляю???
Неизвестный
03.05.2011, 01:56
общий
Прушу прощения. Вместо 0 у меня в голове почему, то оказалась 1. Теперь сначала буду прорешивать на черновике, а потом уже оформлять ответ. Стыдно . Запуталась в тегах и не отследила ошибку. Конечно никакой гиперболы, а только точки I и III четверти.
1. Сделаем замену переменной: t = 1/(x+1), x = 1/t - 1, dx = -dt/t[sup]2[/sup]. Тогда
Исходная функция и полученная первообразная определены только при |x|>1. С учётом этого результат можно записать в виде
где |x|>1.
6. Если поверхность S задана уравнением вида F(x,y,z) = 0, то уравнение нормали в точке M[sub]0[/sub](x[sub]0[/sub],y[sub]0[/sub],z[sub]0[/sub]) будет иметь вид:
где направляющий вектор прямой совпадает с градиентом функции F в точке M[sub]0[/sub], то есть
Исправил, а потом задумался: а стоило ли? Ведь если x < -1, то и числитель, и знаменатель отрицательны, и под корнем будет положительное значение. Насколько я могу судить, и исходная функция, и первообразная будут определены на одном и том же множестве - |x| > 1. Так что, подозреваю, первоначальный вариант был правильным.
Неизвестный
04.05.2011, 12:41
общий
Подскажите,пожалуйста, начало решения интеграла 1/(x*(ln^2(x)+1)) и ещё вот меня смущает такой несобственный интеграл: (0;до множества) 1/((x^2+1)^1/3), может здесь условие неправильное? Заранее благодарю!
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