3x-2y+5z=106x-4y+7z=5 z=?. Created by ainaziksydykova. matematika-ru

Ответ:5Пошаговое объяснение:{3x - 2y + 5z = 10{6x - 4y + 7z = 5умножим первое уравнение на 2:{6x - 4y + 10z = 20{6x - 4y + 7z = 5отнимем от первого уравнения второе:6x - 4y + 10z - 6x + 4y - 7z = 20 - 53z = 15z = 5ArtsoundsArtsoundsОтвет:Новые вопросы в МатематикаПривет, я знаю что яйца надо взять и бросить в перёт да? Сумма шести чисел равна 70. Если одно из этих чисел увеличить в два раза , а остальные оставить без изменений , тогда сумма этих чисел будет равна 78…. Найти сумму пяти неищменившихся чисел.1) (10 : 2 2/3 + 7,5 : 10) * ( 3/40 - 7/30 * 1/4 + 175/360)=2) (0,014 * 1 2/3 + 0,286 : 0,6) : (-0,025) + 18 5/6=3) 74,7 * 2/21 - 105,3 : 7/17 - (-105…,3) : 10,5 - 2 3/7 * 74,7=Помогите с заданием пожалуйстаПомогите пожалуйста решитьПомогите пожалуйста с заданиемПомогите решить задание пожалуйстаНайти производные y' =dy/dx заданных функций2. Сумма 2-кратного и 3-кратного значения денег Агшина составляет125 манатов. Сколько еще манатов нужно, чтобы у Агшина было40 манатов?Решите задачу (краткая запись, решение и ответ).Из 24 кг пшеницы получили 8 кг муки. Сколько килограммов муки можно получить из 15 кг пшеницы?ПредыдущийСледующий Вместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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3x-2y+5z=106x-4y+7z=5 z=?...

ainaziksydykova @ainaziksydykova

July 2022 1 15 Report

3x-2y+5z=10
6x-4y+7z=5 z=?

Answers & Comments

IrkaShevko

Verified answer

Ответ:

Пошаговое объяснение:

{3x - 2y + 5z = 10

{6x - 4y + 7z = 5

умножим первое уравнение на 2:

{6x - 4y + 10z = 20

{6x - 4y + 7z = 5

отнимем от первого уравнения второе:

6x - 4y + 10z - 6x + 4y - 7z = 20 - 5

3z = 15

z = 5

ArtsoundsArtsounds

Ответ:

$3x - 2y + 5z = 10 \\ 6x - 4y + 7z = 5 \\ \\ 3x - 2y + 5z = 10 \: \: \: | \times 2 \\ 6x - 4y + 7z = 5 \\ \\ 3x \times 2 - 2y \times 2 + 5z \times 2 = 10 \times 2 \\ 6x - 4y + 7z = 5 \\ \\ 6x - 4y + 10z = 20 \\ 6x - 4y + 7z = 5 \\ \\ 6x - 4y + 10z - (6x - 4y + 7z) = 20 - 5 \\ 6x - 4y + 10z - 6x + 4y - 7z = 20 - 5 \\ 0x + 0y + 3z = 20 - 5 \\ 3z = 15 \\ z = 15 \div 3 \\ z = 5 \\ \\ \otvet : \: \: \: z = 5$