Предмет: Математика, автор: aleksejsu9

4. Решите уравнение:
а) 0,6(у - 3) - 0,5(у - 1) = 1,5
б) 8(3 - 2x) + 5(3х +5) = 9​

Аноним: 0.6у-1.8-0.5у+0.5=1.5

0.1у=1.5-0.5+1.8

0.1у=2.8

у=28 или
Аноним: 0,6(у-3)-0,5(у-1)=1,5
0,6у-1,8-0,5у+0,5=1,5
0,6у-0,5у=1,5+1,8-0,5
0,1у=2,8
у=2,8:0,1
у=28
Аноним: 2.8*(3-2х)+5*(3х+5)=9

24-16х+15х+25=9

-х+49=9

-х=9-49

-х=-40

х=40 или
Аноним: 8(3-2х)+5(3х+5)=9
24-16х+15х+25=9
-16х+15х=9-24-25
-х=-40
х=40

Ответы

Автор ответа: polina143060
1

а) 0,6y-0,6*3-0,5y+0,5*1=1,5;

0,6y-1,8-0,5y+0,5=1,5;

0,6y-0,5y=1,5+1,8-0,5;

0,1y=2,8;

y=2,8/0,1;

y=28

б) 8 * ( 3 - 2 * x ) + 5 * ( 3 * x + 5 ) = 9

8 * 3 - 8 * 2 * х + 5 * 3 * х + 5 * 5 = 9

24 - 16 * х + 15 * х + 25 = 9

49 - 16 * х + 15 * х = 9

49 - х = 9

- х = 9 - 49

- х = - 40

х = 40 / ( - 1 )

х = 40 / 1

х = 40

Аноним: у тебя крыша поехала
aleksejsu9: это точно
Аноним: надо удалить его ответ
aleksejsu9: кто может решите пж 12,31 тест
polina143060: я как бы исправила
Аноним: давай
Аноним: свой тест
Автор ответа: PainfuI
1

Вот решение двух уравнений.

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