Question

4х + 5 = 2х + 3(5х + 6)
4. 25 – 4(4х – 3) = 3(5х + 2)
5. 7х – 2(5х – 3) – 4(2 – 3х) = 1
6. 9(2x – 1) + 2 = 2(9x – 3) – 1
7. 7х + 5 = 5х + 7
8. 4х = 4 + 2(3х + 5)
9. 4(2х – 5) – х = 3х + 8
10. 7(3х – 2) – 6(4х + 7) = 18х

Answer 1

Ответ:

Пошаговое объяснение:

4х + 5 = 2х + 3(5х + 6)

4x + 5 = 2x + 15x + 18

4x + 5 = 17x + 18

17x - 4x = 5 - 18

13x = -13

x = -1

4. 25 – 4(4х – 3) = 3(5х + 2)

25 - 16x + 12 = 15x + 6

37 - 16x = 15x + 6

15x + 16x = 37 - 6

31x = 31

x = 1

5. 7х – 2(5х – 3) – 4(2 – 3х) = 1

7x - 10x + 6 - 8 + 12x = 1

9x - 2 = 1

9x = 1 + 2

9x = 3

x = 3 : 9

x = 1/3

6. 9(2x – 1) + 2 = 2(9x – 3) – 1

18x - 9 + 2 = 18x - 6 - 1

18x - 7 = 18x - 7

18x - 18x = 7 - 7

0 = 0

x є (-∞ ; ∞)

уравнение имеет множество решений

7. 7х + 5 = 5х + 7

7x - 5x = 7 - 5

2x = 2

x = 1

8. 4х = 4 + 2(3х + 5)

4x = 4 + 6x + 10

4x = 14 + 6x

6x - 4x = -14

2x = -14

x = -14:2

x = -7

9. 4(2х – 5) – х = 3х + 8

8x - 20 - x = 3x + 8

7x - 20 = 3x + 8

7x - 3x = 20 + 8

4x = 28

x = 28 : 4

x = 7

10. 7(3х – 2) – 6(4х + 7) = 18х

21x - 14 - 24x - 42 = 18x

-3x - 56 = 18x

18x + 3x = -56

21x = -56

x = -56 : 21

x = -2 14/21

x = -2 2/3