Question

1.{х+у=5 {х-у=72. {а+в=4{3а-5в=203. {2х-3у=-1{3х+4у=7​ Смотреть ответ yurionice2K20 yurionice2K20 Объяснение: 1. из 2) х=7+у 7+у+у=5 х=7-1=6 7+2у=5 2у=5-7 2у=-2 у= -1 Ответ: (6; -1). 2. из 1) а=4-в 3(4-в)-5в=20 а=4+1=5 12-3в-5в=20 12-8в=20 -8в=20-12 -8в=8 в= -1 Ответ: а=5; в= -1. 3. {2х-3у=-1 |×3 {6х-9у=-3 {3х+4у=7 |× (-2) {-6х-8у=-14 (Складываем уравнения, получаем: ) -17у=-17 у= 1 2х-3×1= -1 2х-3=-1 2х=-1+3 2х=2 х=1 Ответ: (1;1). Слушай, можешь помочь мне с геометрией? Задание в профиле, я его 3 раза запустила, баллов наберётся окола 110 со всех. (Это один и тот же вопрос) Помоги пожалуйста. Спасибо вам огромное! Вы бог... Новые вопросы в Геометрия Пареллограмның екі қабырғасы Допоможіть будь ласка завдання 6 сформулюйте означення кола​ сформулюйте означення рівняння фігури​ Пожалуйста помогите !!!!!! Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Похоже, что вы предоставили решение системы линейных уравнений и запросили помощь с геометрией. Давайте начнем с решения системы уравнений:

1. Для первой системы уравнений:

   • уравнение 1: x + y = 5
   • уравнение 2: x - y = 72

   Вы можете решить эту систему, сложив оба уравнения, чтобы избавиться от y: (x + y) + (x - y) = 5 + 72 2x = 77 x = 77 / 2 x = 38.5

   Теперь, используя значение x, найдем y в первом уравнении: 38.5 + y = 5 y = 5 - 38.5 y = -33.5

   Ответ для первой системы уравнений: (x, y) = (38.5, -33.5)

2. Для второй системы уравнений:

   • уравнение 1: a + b = 43
   • уравнение 2: 3a - 5b = 203

   Вы можете решить эту систему, выразив a из первого уравнения и подставив его во второе: a = 43 - b

   Теперь подставим это значение a во второе уравнение: 3(43 - b) - 5b = 203

   Раскроем скобки: 129 - 3b - 5b = 203

   Сгруппируем b: -8b = 203 - 129 -8b = 74 b = 74 / (-8) b = -9.25

   Теперь, используя значение b, найдем a в первом уравнении: a + (-9.25) = 43 a = 43 + 9.25 a = 52.25

   Ответ для второй системы уравнений: (a, b) = (52.25, -9.25)

3. Для третьей системы уравнений:

   • уравнение 1: 2x - 3y = -1
   • уравнение 2: 3x + 4y = 7

   Вы можете решить эту систему, используя метод умножения одного из уравнений так, чтобы коэффициенты y сократились. В данном случае, умножим второе уравнение на -3: -3(3x + 4y) = -3 * 7 -9x - 12y = -21

   Теперь сложим оба уравнения, чтобы избавиться от y: (2x - 3y) + (-9x - 12y) = -1 - 21 -7x - 15y = -22

   Теперь решим полученное уравнение для x: -7x = -22 + 15y x = (22 - 15y) / 7

   Теперь подставим значение x в первое уравнение: 2 * ((22 - 15y) / 7) - 3y = -1

   Упростим это уравнение: (44 - 30y) / 7 - 3y = -1

   Умножим обе стороны на 7, чтобы избавиться от дробей: 44 - 30y - 21y = -7

   Сгруппируем y: -51y = -7 - 44 -51y = -51 y = -51 / (-51) y = 1

   Теперь найдем x, используя значение y: x = (22 - 15 * 1) / 7 x = 7 / 7 x = 1

   Ответ для третьей системы уравнений: (x, y) = (1, 1)

Таким образом, решения для всех трех систем уравнений следующие:

1. (x, y) = (38.5, -33.5)
2. (a, b) = (52.25, -9.25)
3. (x, y) = (1, 1)

Что касается вопроса о геометрии, пожалуйста, уточните, с какой именно задачей в геометрии вы нуждаетесь в помощи, и я постараюсь вам помочь.