Запишите уравнение прямой СB, проходящей через точки С (−1;1) , В (3;−1). Created by Димитрааа. geometriya-ru

Уравнение прямой:ах+by+c=0{-a+b+c=0 |3(домножаем первое уравнение на 3){3a-b+c=0{-3а+3b+3c=0 |+(складываем первое и второе){3a-b+c=02b+4c=0 Переносим все кроме b вправо2b=-4cb=-2cПодставляем в любое из уравнений b3a+2c+c=03a=-3ca=-cВсе значения подставляем в самую первую формулуах+by+c=0-cx-2cy+c=0(выносим -с за скобки)-c(x+2y-1)=0Переписываем только то,что в скобкахх+2у-1=0 -уравнение прямойНовые вопросы в ГеометрияДано: SABCD - правильная пирамида, AD=SD=4, a - секущая плоскость, В принадлежит а, К принадлежит а, a||SD, m - наибольшая сторона сечения пирамиды пл….a. Найти: m^2Дано: правильная пирамида, Р осн=24. Найти: длину отрезка, по которому пл.MNK пересекает основание пирамидыДано: МК=15, NK=9, MNK=90 градусов. Найти: длину отрезка, по которому пл.MNK пересекает основание пирамидыДано: SАBСD - правильная пирамида, AD=AS, МК||AB, Sasd=36V3. Найти: MKОбчислити значення сtg a, якщо cos a = 12/13Дано: А...С1 - правильная призма, Sавс=16V3, МК||A1C1. Найти: MK133. На сторонах рівносторон- нього трикутника АВС від- кладено рівні відрізки AD, CF i BE (мал. 103). До- вести, що трикутник EFD рівносторонній. пж…допоможіть Дано: А...Д1 - прямоугольный параллелепипед, С1К:КВ1=3:2. Периметр сечения параллелепипеда пл.DСK равен 50. Найти: Sполн параллелепипедаНа рисунку 101 АВ=ВС, <BAD=<BCD. Доведіть, що ∆ABD=∆CBD.На рисунку 98 BD=BE, DC=AE, <BDC-<BEA. Знайдіть довжину вiдрiзка AD, якщо СЕ = 6 см.ПредыдущийСледующийВместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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AD=SD=4, a - \u0441\u0435\u043a\u0443\u0449\u0430\u044f \u043f\u043b\u043e\u0441\u043a\u043e\u0441\u0442\u044c, \u0412 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0438\u0442 \u0430, \u041a \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0438\u0442 \u0430, a||SD, m - \u043d\u0430\u0438\u0431\u043e\u043b\u044c\u0448\u0430\u044f \u0441\u0442\u043e\u0440\u043e\u043d\u0430 \u0441\u0435\u0447\u0435\u043d\u0438\u044f \u043f\u0438\u0440\u0430\u043c\u0438\u0434\u044b \u043f\u043b.a. \u041d\u0430\u0439\u0442\u0438: m^2"},{"id":49784676,"content":"\u0414\u0430\u043d\u043e: \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0430\u044f \u043f\u0438\u0440\u0430\u043c\u0438\u0434\u0430, \u0420 \u043e\u0441\u043d=24. \u041d\u0430\u0439\u0442\u0438: \u0434\u043b\u0438\u043d\u0443 \u043e\u0442\u0440\u0435\u0437\u043a\u0430, \u043f\u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u043f\u043b.MNK \u043f\u0435\u0440\u0435\u0441\u0435\u043a\u0430\u0435\u0442 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0438\u0440\u0430\u043c\u0438\u0434\u044b"},{"id":49784668,"content":"\u0414\u0430\u043d\u043e: \u041c\u041a=15, NK=9, MNK=90 \u0433\u0440\u0430\u0434\u0443\u0441\u043e\u0432. \u041d\u0430\u0439\u0442\u0438: \u0434\u043b\u0438\u043d\u0443 \u043e\u0442\u0440\u0435\u0437\u043a\u0430, \u043f\u043e \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u043f\u043b.MNK \u043f\u0435\u0440\u0435\u0441\u0435\u043a\u0430\u0435\u0442 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0438\u0440\u0430\u043c\u0438\u0434\u044b"},{"id":49784659,"content":"\u0414\u0430\u043d\u043e: S\u0410B\u0421D - \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0430\u044f \u043f\u0438\u0440\u0430\u043c\u0438\u0434\u0430, AD=AS, \u041c\u041a||AB, Sasd=36V3. \u041d\u0430\u0439\u0442\u0438: MK"},{"id":49784643,"content":"\u041e\u0431\u0447\u0438\u0441\u043b\u0438\u0442\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044f \u0441tg a, \u044f\u043a\u0449\u043e cos a = 12\/13"},{"id":49784612,"content":"\u0414\u0430\u043d\u043e: \u0410...\u04211 - \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0430\u044f \u043f\u0440\u0438\u0437\u043c\u0430, S\u0430\u0432\u0441=16V3, \u041c\u041a||A1C1. \u041d\u0430\u0439\u0442\u0438: MK"},{"id":49784541,"content":"133. \u041d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0430\u0445 \u0440\u0456\u0432\u043d\u043e\u0441\u0442\u043e\u0440\u043e\u043d- \u043d\u044c\u043e\u0433\u043e \u0442\u0440\u0438\u043a\u0443\u0442\u043d\u0438\u043a\u0430 \u0410\u0412\u0421 \u0432\u0456\u0434- \u043a\u043b\u0430\u0434\u0435\u043d\u043e \u0440\u0456\u0432\u043d\u0456 \u0432\u0456\u0434\u0440\u0456\u0437\u043a\u0438 AD, CF i BE (\u043c\u0430\u043b. 103). \u0414\u043e- \u0432\u0435\u0441\u0442\u0438, \u0449\u043e \u0442\u0440\u0438\u043a\u0443\u0442\u043d\u0438\u043a EFD \u0440\u0456\u0432\u043d\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0456\u0439. \u043f\u0436 \u0434\u043e\u043f\u043e\u043c\u043e\u0436\u0456\u0442\u044c \u200b"},{"id":49784459,"content":"\u0414\u0430\u043d\u043e: \u0410...\u04141 - \u043f\u0440\u044f\u043c\u043e\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u0439 \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0435\u043f\u0438\u043f\u0435\u0434, \u04211\u041a:\u041a\u04121=3:2. \u041f\u0435\u0440\u0438\u043c\u0435\u0442\u0440 \u0441\u0435\u0447\u0435\u043d\u0438\u044f \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0435\u043f\u0438\u043f\u0435\u0434\u0430 \u043f\u043b.D\u0421K \u0440\u0430\u0432\u0435\u043d 50. \u041d\u0430\u0439\u0442\u0438: S\u043f\u043e\u043b\u043d \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0435\u043f\u0438\u043f\u0435\u0434\u0430"},{"id":49784431,"content":"\u041d\u0430 \u0440\u0438\u0441\u0443\u043d\u043a\u0443 101 \u0410\u0412=\u0412\u0421, <BAD=<BCD. \u0414\u043e\u0432\u0435\u0434\u0456\u0442\u044c, \u0449\u043e \u2206ABD=\u2206CBD.\u200b"},{"id":49784327,"content":"\u041d\u0430 \u0440\u0438\u0441\u0443\u043d\u043a\u0443 98 BD=BE, DC=AE, <BDC-<BEA. \u0417\u043d\u0430\u0439\u0434\u0456\u0442\u044c \u0434\u043e\u0432\u0436\u0438\u043d\u0443 \u0432i\u0434\u0440i\u0437\u043a\u0430 AD, \u044f\u043a\u0449\u043e \u0421\u0415 = 6 \u0441\u043c.\u200b"}] window.jsData.nearestQuestions = { next: { url: '/task/30830861', id: '30830861' }, prev: { url: '/task/30830858', id: '30830858' } } window.jsData.pubmaticAllowedForIp = true window.jsData.userLocationInfo = {"location":{"city":{"geoname_id":5821086,"names":{"de":"Cheyenne","en":"Cheyenne","es":"Cheyenne","fr":"Cheyenne","ja":"\u30b7\u30e3\u30a4\u30a2\u30f3","pt-BR":"Cheyenne","ru":"\u0428\u0430\u0439\u0435\u043d\u043d","zh-CN":"\u590f\u5ef6"}},"continent":{"code":"NA","geoname_id":6255149,"names":{"de":"Nordamerika","en":"North America","es":"Norteam\u00e9rica","fr":"Am\u00e9rique du Nord","ja":"\u5317\u30a2\u30e1\u30ea\u30ab","pt-BR":"Am\u00e9rica do Norte","ru":"\u0421\u0435\u0432\u0435\u0440\u043d\u0430\u044f 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Запишите уравнение прямой СB, проходящей через точки С (−1;1) , В (3;−1)...

Димитрааа @Димитрааа

July 2022 1 7 Report

Запишите уравнение прямой СB, проходящей через точки С (−1;1) , В (3;−1)

Answers & Comments

СовушкинДомик Уравнение прямой:
ах+by+c=0

{-a+b+c=0 |3(домножаем первое уравнение на 3)
{3a-b+c=0

{-3а+3b+3c=0 |+(складываем первое и второе)
{3a-b+c=0

2b+4c=0
Переносим все кроме b вправо
2b=-4c
b=-2c

Подставляем в любое из уравнений b

3a+2c+c=0
3a=-3c
a=-c

Все значения подставляем в самую первую формулу

ах+by+c=0
-cx-2cy+c=0(выносим -с за скобки)
-c(x+2y-1)=0

Переписываем только то,что в скобках
х+2у-1=0 -уравнение прямой