ПОМОГИТЕ,50 БАЛЛОВ. СРОЧНО ПОЖАЛУЙСТА,. Created by olgaaa8944. matematika-ru

Ответ:1. 3x-7y=11.(-1;-2)→3*(-1)-7*(-2)=-3+14=11. Является.(1;-2)→3*1-7*(-2)=3+14=17. Не является.(8;2)→3*8-7*2=24-14=10. Не является.(-7;-5)→3*(-7)-7*(-5)=-7*(3-5)=14. Не является.(6;1)→3*6-7*1=18-7=11. Является.Ответ : (-1;-2) ; (6;1).2. {5х+у=2, → у=2-5х. {4х+3у=-16. 4х+3(2-5х)=-16 4х+6-15х=-16 -11х+6=-16 -11х=-16-6 -11х = -22 х = 2у=2-5*2у=2-10у = - 8Ответ : ( 2 ; - 8 ).3. {3х-у=5, |*3 {4х+3у=11.{9х-3у=15,{4х+3у=11.----------------13х=26 х = 2---------------9*2-3у=1518-3у=15-3у=15-18-3у = -3у = 1Ответ : ( 2 ; 1 ). Реклама Реклама Artsounds Artsounds № 1Ответ : ( - 1; - 2 ) и ( 6; 1 ) ________________________________№ 2Ответ : ( 2; - 8 ) ________________________________№ 3Ответ : ( 2; 1 ) Реклама Реклама Новые вопросы в Математика помогите решить, дам 40 баллов ПЖ ПОМОГИТЕ С 1,4,6 ЗАДАНИЕМ СРОЧНО привести к общему знаменателю Дробь 1/9 ; 4/7 ; 5/6; 7/10 помните пожалуйста,срочно! 100 БАЛЛОВ,ПОМОГИТЕ! Помогите с рисунком и решением, срочно!!!! 3. Представьте бесконечные периодические дроби в виде обыкновен- ной и сократите сократимые дроби: 1) 0,444...; 0,3535...;0,5252...;0,080808...; 2) 0, … 666...; 1,123123...; 2,3636...; 5,015015...; 3) 2,(38); 1,(24); 3,12(5); 1,14(72); 4) 3,3(6); 1,2(36); 3,21(5); 3,41(27). Помогите, с решением, и рисунком Помогите СРОЧНО!!!!! 2. деление состаглом орушить ~~- Выполните деление состатком и проверь результат: 37:2 38:4 64: 13 97: 55:4 47:5 58: 15 95: 31 очень срочно!!!!!!!!! Предыдущий Следующий Реклама - это не так уж плохо Реклама - это не так уж плохо Понимаем - вы пришли сюда не за рекламой. Но она помогает нам предоставлять бесплатный доступ к Знаниям. Пожалуйста, внесите наш сайт в список разрешенных. ОК, разблокирую рекламу на Знаниях! 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,50 БАЛЛОВ. СРОЧНО ПОЖАЛУЙСТА,...

olgaaa8944 @olgaaa8944

October 2021 1 13 Report

ПОМОГИТЕ,50 БАЛЛОВ. СРОЧНО ПОЖАЛУЙСТА,

Answers & Comments

LordMG

Ответ:

1. 3x-7y=11.

(-1;-2)→3*(-1)-7*(-2)=-3+14=11. Является.

(1;-2)→3*1-7*(-2)=3+14=17. Не является.

(8;2)→3*8-7*2=24-14=10. Не является.

(-7;-5)→3*(-7)-7*(-5)=-7*(3-5)=14. Не является.

(6;1)→3*6-7*1=18-7=11. Является.

Ответ : (-1;-2) ; (6;1).

2. {5х+у=2, → у=2-5х.

{4х+3у=-16. 4х+3(2-5х)=-16

4х+6-15х=-16

-11х+6=-16

-11х=-16-6

-11х = -22

х = 2

у=2-5*2

у=2-10

у = - 8

Ответ : ( 2 ; - 8 ).

3. {3х-у=5, |*3

{4х+3у=11.

{9х-3у=15,

{4х+3у=11.

----------------

13х=26

х = 2

---------------

9*2-3у=15

18-3у=15

-3у=15-18

-3у = -3

у = 1

Ответ : ( 2 ; 1 ).

Artsounds Artsounds

№ 1

$3x - 7y = 11 \\ \\ 3 \times ( - 1) - 7 \times ( - 2) = - 3 + 14 = 11 \\ 3 \times 1 - 7 \times ( - 2) = 3 + 14 = 17 \\ 3 \times 8 - 7 \times 2 = 24 - 14 = 10 \\ 3 \times ( - 7) - 7 \times ( - 5) = - 3 \times 7 - 7 \times ( - 5) = - 7 \times (3 - 5) = - 7 \times ( - 2) = 14 \\ 3 \times 6 - 7 \times 1 = 18 - 7 = 11$

Ответ : ( - 1; - 2 ) и ( 6; 1 )

________________________________

№ 2

$5x + y = 2 \\ 4x + 3y = - 16 \\ \\ y = 2 - 5x \\ 4x + 3y = - 16 \\ \\ 4x + 3 \times (2 - 5x) = - 16 \\ 4x + 6 - 15x = - 16 \\ - 11 = - 16 - 6 \\ - 11x = - 22 \\ x =( - 22) \div ( - 11) \\ x = 2 \\ \\ \\ y = 2 - 5x \\ y = 2 - 5 \times 2 = 2 - 10 \\ y = - 8 \\ \\$

Ответ : ( 2; - 8 )

________________________________

№ 3

$3x - y = 5 \\ 4x + 3y = 11 \\ \\ 3x - y = 5 \: \: | \times 3 \\ 4x + 3y = 11 \\ \\ 9x - 3y = 15 \\ 4x + 3y = 11 \\ \\ 9x - 3y + 4x + 3y = 15 + 11 \\ 13x = 26 \\ x = 26 \div 13 \\ x = 2 \\ \\ 3x - y = 5 \\ 3 \times 2 - y = 5 \\ - y = 5 - 6 \\ - y = - 1 \\ y = 1 \\ \\$