Question

СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

Ответ:

Объяснение:

1)

19 - 5(3х - 1) = 9

19 - 15х + 5 = 9

-15х = 9 - 24

-15 = - 15

х =- 15 : ( -15)

х = 1

2)

30 + 5(3х - 1) = 35х - 25

30 + 15х - 5 = 35х - 25

15х - 35х = - 25 - 25

- 25х = - 50

х = - 50 : ( - 25)

х = 2

3)

(2х + 1)/5 = 1

2х + 1 = 1 * 5

2х + 1 = 5

2х = 5 - 1

2х = 4

х = 4 : 2

х= 2

4)

(8х - 3)/7 - (3х + 1)/10 = 2

10(8х - 3) - 7(3х + 1) = 2 * 7 * 10

80х - 30 - 21х - 7 = 140

59х = 140 + 37

59х = 177

х = 177 : 59

х= 3

Answer 2

Объяснение:

1)

19 - 5(3х - 1) = 9

19 - 15х + 5 = 9

24 - 15х = 9

-15х = 9 - 24

-15х = -15

х = -15 : (-15)

х = 1

2)

30 + 5(3х - 1) = 35х - 25

30 + 15х - 5 = 35х - 25

25 + 15х = 35х - 25

15х - 35х = -25 - 25

-20х = -50

х = -50 : (-20)

х = 2,5

3)

(2х + 1)/5 = 1 | * 5

2х + 1 = 5

2х = 5 - 1

2х = 4

х = 4 : 2

х = 2

4)

(8х - 3)/7 - (3х + 1)/10 = 2 | * 70

10 * (8х - 3) - 7 * (3х + 1) = 70 * 2

80х - 30 - 21х - 7 = 140

59х - 37 = 140

59х = 140 + 37

59х = 177

х = 177 : 59

х = 3