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Доброго времени суток уважаемые эксперты! Вопросы: как решить вот это: Составить канонические, параметрические или общие ур-ния прямой Р, проходящей через точку N, используя данные о расположении Р относительно других объектов. N(2,3,2), Р (такой знак U, только перевернут на право, извиняюсь забыл) альфа:3х-2у+z-2=0, Р перпендикуляр. вектору а={2,0,1} вот это: альфа || Р: х-1/0=у/2=z+1/3, q: х=3t-1, y=2t, z=-t+1, q (такой знак U, только перевернут на право) альфа, N(2,2,3). вот это : найти угол между прямой Р из 1-ой задачи и плоскостью альфа из второй задачи. вот это: Определить параметры, входящии в уравнения прямых и плоскостей, используя данные об их взаимном расположении. альфа: Ах+2у-4z+d=0, Р:х-3/4=у-1/-4=z+3/1, Р (такой знак U, только перевернут на право) альфа. Пожалуйста помогите, не сочтите за наглость, но если можно напишите поподробней. Заранее спасибо!
Обсуждение
Неизвестный
24.10.2007, 23:39
общий
это ответ
Здравствуйте, Vitek Koval! Определить параметры, входящие в уравнения прямой и плоскости, используя данные об их взаимном расположении. α: Ах+2у-4z+d=0, Р: (х-3)/4 = (у-1)/(-4) = (z+3)/1, Р ⊂ α.
Из уравнения плоскости α видим, что координаты её нормального вектора такие: <b>n</b>(A;2;-4). Из уравнения прямой находим координаты направляющего вектора: <b>l</b>(4;-4;1). Т.к. Р ⊂ α, то <b>n</b> ⊥ <b>l</b>. Значит, <b>n</b>*<b>l</b> = 0. <b>n</b>*<b>l</b> = A*4 + 2*(-4) + (-4)*1 = 4A – 12 = 0, A = 3. Точка A(3;1;-3) лежит на прямой P (это видно из уравнения), значит, A также лежит и в плоскости α. Подставим координаты этой точки в уравнение плоскости: 3*3 + 2*1 – 4*(-3) + d = 0, 23 + d = 0, d = -23.
Ответ: α: 3х + 2у – 4z - 23 = 0.
Неизвестный
25.10.2007, 06:19
общий
это ответ
Здравствуйте, Vitek Koval!
Решение Вашей первой задачи:
Этот знак означает принадлежит, или является подмножеством.
Ваша прямая описывается параметрическим уравнением x = 2 + At, y = 3 + Bt, z = 2 + Ct поскольку проходит через точку (2, 3, 2). Для неё также верно 3х-2у+z-2=0, т.е. z = 2 - 3x + 2y = 2 - 6 - 3At + 6 + 2Bt = 2 - 3At + 2Bt. Т.е. C = 2B - 3A. Наконец, вектор (A, B, C) перпендикулярен (2, 0, 1), т.е. их скалярное произведение 2A + 0B + C равно 0, т.е. 2A + C = 0. -2A = C = 2B - 3A A = 2B C = 2B - 3A = A - 3A = -2A = -4B Итого x = 2 + 2Bt, y = 3 + Bt, C = 2 - 4Bt или вводя u = Bt получим x = 2 + 2u, y = 3 + u, C = 2 - 4u. В каноническом виде u = (x - 2)/2 = (y -3) = (z - 2)/-4
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