СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА

Ответы
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
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