помогите пожалуйста решить первое задание а,б,в. Created by natalia19802. algebra-ru

А) {y=2x-1{-2x+3y=9{-2x-y=-1 /*(-1){-2x+3y=9{2x+y=1{-2x+3y=9{4y=10{2x+y=1{y=2.5{2x+2.5=12x=1-2.52x=1.5{x=0.75{y=2.5б) {4x+7y=40{-4x+9y=24{16y=64{4x+7y=40{y=4{4x+28=404x=40-284x=12x=3y=4в) {3x-7y=32{x=-5y-4{3x-7y=32 /*5{5y+x=-4. /*7{15x-35y =160{35y+7x=-28{22x=132{15x-35y=160{x=6}90-35y=160-35y=160-90-35y=70{y=-2{x=6г) {2x-3y=-4 {5x+y=7. /*3{2x-3y=-4{15x+3y=21{17x=17{2x-3y=-4{x=1{2-3y=-4-3y=-6{y=2{x=1 Реклама Реклама Новые вопросы в Алгебра Помогите с частью контрольной пожалуйста Прошу помочь с контрольной помогите пожалуйста решить решите пожалуйста срочно!!!! На прямой в данном порядке лежат три точки (расстояние между ними может меняться). Четвёртая точка не находится на прямой. Можно ли найти такую позици … ю для точки R и разместить точки D, E и C на таких расстояниях друг от друга, что треугольники DRC и DRE будут равнобедренными? Помогите пж, только ответ и понятный овтет! помогите с алгеброй рокладіть на множники:2ax+Звх+2ay+Зву последний давай огромное спасибо что помагаешь ПОМОГИТЕ ПОЖАЛУЙСТА, СРОЧНО Найди значение выражения при d=-0,11предварительно упростив его (d-8)(d+2)-(d+6)(d-15)Значение выражения равно= y²(2y²-4y²+7) скоростить вираз пожалуйста 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 решить первое задание а,б,в...

natalia19802 @natalia19802

November 2021 1 15 Report

помогите пожалуйста решить первое задание а,б,в

Answers & Comments

ира897 А) {y=2x-1
{-2x+3y=9
{-2x-y=-1 /*(-1)
{-2x+3y=9

{2x+y=1
{-2x+3y=9

{4y=10
{2x+y=1

{y=2.5
{2x+2.5=1
2x=1-2.5
2x=1.5
{x=0.75
{y=2.5
б) {4x+7y=40
{-4x+9y=24

{16y=64
{4x+7y=40

{y=4
{4x+28=40
4x=40-28
4x=12
x=3
y=4
в) {3x-7y=32
{x=-5y-4

{3x-7y=32 /*5
{5y+x=-4. /*7

{15x-35y =160
{35y+7x=-28

{22x=132
{15x-35y=160

{x=6
}90-35y=160
-35y=160-90
-35y=70
{y=-2
{x=6

г) {2x-3y=-4
{5x+y=7. /*3

{2x-3y=-4
{15x+3y=21

{17x=17
{2x-3y=-4

{x=1
{2-3y=-4
-3y=-6
{y=2
{x=1