Question

50 Баллов! Помогите с тестом! 1. Дана система уравнений: {2a+b=12 {−b+a=0 Вычисли значение переменной b. 2.Дана система двух линейных уравнений: {y+11x=2 {4y−11x=4 Найди значение переменной y . 3.Реши систему уравнений: {2x−y=5 {x−5,5y=11 4.Реши систему уравнений способом алгебраического сложения. {u−4y=5 {3u−7y=32 Посмотреть ответы ulchik030 ulchik030 решение смотри на фото. Не верно только третье) пасиб Karina270904 Karina270904 Ответ: 1)4. 2)1,2 3)(1,65;-1,7) 4)(18,6;3,4) Объяснение: 1))))) {2а+b=12 {-b+a=0         {3a=12     {-b+a=0 {a=4 {b=4 Ответ:4. 2)))))) {у+11х=2 {4у-11х=4    {5y=6 {y=1,2 3))))))) {2x-y=5 {x-5,5y=11 /*2    {2x-y=5    {2x-11y=22 {10y= -17 {2x-y=5      {y= - 1,7      {2x= 3,3 {y= -1,7 {x= 1,65   4)))))))) {u-4y=5 /*3 {3u-7y=32    {3u-12y=15    {3u-7y=32 {5y=17 {u-4y=5     {y=3,4     {u=18,6 P.S. все ответы точно правильны Новые вопросы в Алгебра FT // PR угол RFT = 30 градусам Найти угол SFT и угол RFP FT // PR угол RFT = 30 градусам Найти угол SFT и угол RFP FT // PR угол RFT = 30 градусам Найти угол SFT и угол RFP ПОМОГИТЕ ПОЖАЛУЙСТА!!! алгебра 7 класс! фото прикреплю, задание не очень сложное, но я не могу решит) Шахматист играет не менее одной партии в день и не более 12 за любую неделю (неде-ля начинается в понедельник и заканчивается в воскресенье). Докажите … , что найдется несколько подряд идущих дней, за которые он сыграет ровно 20 партий. 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

Для решения системы уравнений и нахождения значений переменных, давайте последовательно решим каждую задачу.

1. Дана система уравнений: {2a + b = 12 {-b + a = 0

Чтобы найти значение переменной b, решим систему уравнений. Для этого сложим оба уравнения, чтобы устранить переменную b:

2a + b - b + a = 12 + 0

Получим: 3a = 12

Теперь найдем значение переменной a: a = 12 / 3 a = 4

Теперь, когда у нас есть значение a, подставим его в одно из уравнений, чтобы найти значение b:

2 * 4 + b = 12 8 + b = 12

Вычтем 8 из обеих сторон:

b = 12 - 8 b = 4

Ответ: значение переменной b равно 4.

2. Дана система уравнений: {y + 11x = 2 {4y - 11x = 4

Для нахождения значения переменной y, сложим оба уравнения, чтобы устранить переменную x:

y + 11x + 4y - 11x = 2 + 4

Получим: 5y = 6

Теперь найдем значение переменной y: y = 6 / 5 y = 1.2

Ответ: значение переменной y равно 1.2.

3. Дана система уравнений: {2x - y = 5 {x - 5.5y = 11

Для решения этой системы уравнений применим метод алгебраического сложения. Умножим первое уравнение на 5.5 и второе уравнение на 1, чтобы устранить переменную y:

(2x - y) * 5.5 = 5 * 5.5 (x - 5.5y) * 1 = 11 * 1

Приведем уравнения к более простому виду:

11x - 5.5y = 27.5 x - 5.5y = 11

Теперь вычтем второе уравнение из первого, чтобы устранить переменную y:

(11x - 5.5y) - (x - 5.5y) = 27.5 - 11

Получим: 10x = 16.5

Теперь найдем значение переменной x: x = 16.5 / 10 x = 1.65

Теперь, когда у нас есть значение x, подставим его во второе уравнение, чтобы найти значение y:

1.65 - 5.5y = 11

Вычтем 1.65 из обеих сторон:

-5.5y = 11 - 1.65 -5.5y = 9.35

Теперь найдем значение переменной y: y = 9.35 / -5.5 y ≈ -1.7

Ответ: значения переменных x и y равны, соответственно, 1.65 и около -1.7.

4. Дана система уравнений: {u - 4y = 5 {3u - 7y = 32

Для решения этой системы уравнений применим метод алгебраического сложения. Умножим первое уравнение на 7 и второе уравнение на 4, чтобы устранить переменную y:

(u - 4y) * 7 = 5 * 7 (3u - 7y) * 4 = 32 * 4

Приведем уравнения к более простому виду:

7u - 28y = 35 12u - 28y = 128

Теперь вычтем первое уравнение из второго, чтобы устранить переменную y:

(12u - 28y) - (7u - 28y) = 128 - 35

Получим: 5u = 93

Теперь найдем значение переменной u: u = 93 / 5 u = 18.6

Теперь, когда у нас есть значение u, подставим его в первое уравнение, чтобы найти значение y:

18.6 - 4y = 5

Вычтем 18.6 из обеих сторон:

-4y = 5 - 18.6 -4y = -13.6

Теперь найдем значение переменной y: y = -13.6 / -4 y ≈ 3.4

Ответ: значения переменных u и y равны, соответственно, 18.6 и около 3.4.