помогите пожалуйста,алгебра 7 класс. Created by tanyastvkova. algebra-ru

1)домножим на10:2х-5х=-30-3х=-30х=102)3а^2+6а-(а^2+6а+9)=3а^2+6а-а^2-6а-9=2а^2-9=2*(-5)^2-9=413)А)81х^3-х=х(81х^2-1)=х(9х-1)(9х+1)б)3у^2-30у+75=3(у^2-10у+25)=3(у-5)^24)пусть х-двухместныеу-трехместные{х+у=6;{2х+3у=14.домножим первое уравнение на 2 и решим способом сложения(вычитания):{2х+2у=12{2х+3у=14-у=-2у=2подставим значение в любое из уравнений:х+2=6х=45)у-у0=к(х-х0)у-8.2=3.6(х+0.5)у-8.2=3.6х+1.8у=3.6х+10проверка:8.2=3.6*(-0.5)+108.2=8.2Вроде верно Реклама Реклама Новые вопросы в Алгебра 1.[1 балл] Определите коэффициент и степень 1/6 1) H5 2) 5/6 5 3) 5/6 б 4) 5 и 5 4Pi * e * H * a * (5x ^ 5 * y)/6 Упростите выражение: ПОЖАЛУЙСТА, СПАСИБО ТЕМ КТО ОТВЕТИТ 2. Представьте в виде дроби ОТДАЮ ВСЁ ЧТО ЕСТЬ ПОМОГИТЕ!!!! албебра помогите пжпж 50 баллов При каком наименьшем натуральном число !=1⋅2⋅…⋅ делится на 2 600 000? решите пожалуйста !!!! 60 балов Пожалуйста очень нужно помогите! Фото Знайдіть область визначення функції: а) у = 2х – 10;б) у = 2,5 – х. Знайдіть об'єднання та переріз проміжків: a) (4; 7] i [-1; 5); б) (-∞; 1] i (0; +∞) 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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помогите пожалуйста,алгебра 7 класс...

tanyastvkova @tanyastvkova

October 2021 1 5 Report

помогите пожалуйста,алгебра 7 класс

Answers & Comments

ArturSłavianin 1)домножим на10:
2х-5х=-30
-3х=-30
х=10
2)3а^2+6а-(а^2+6а+9)=3а^2+6а-а^2-6а-9=
2а^2-9=2*(-5)^2-9=41
3)А)81х^3-х=х(81х^2-1)=
х(9х-1)(9х+1)
б)3у^2-30у+75=3(у^2-10у+25)=
3(у-5)^2
4)пусть х-двухместные
у-трехместные
{х+у=6;
{2х+3у=14.
домножим первое уравнение на 2 и решим способом сложения(вычитания):
{2х+2у=12
{2х+3у=14
-у=-2
у=2
подставим значение в любое из уравнений:
х+2=6
х=4
5)у-у0=к(х-х0)
у-8.2=3.6(х+0.5)
у-8.2=3.6х+1.8
у=3.6х+10
проверка:
8.2=3.6*(-0.5)+10
8.2=8.2
Вроде верно