Question

О 909. Знайдіть корінь рівняння: 1) (4x - 2) + (5x-4)= 9-(5-11x);
2) (7-8x) - (9-12x) + (5x + 4) = -16;
3) 3(4x - 5)-10(2x - 1) = 33;
4) 9(3(x + 1) - 2x) = 7(x + 1).​

Answer 1

Ответ:

1) (4x-2)+(5x-4)=9-(5-11x)

4x-2+5x-4=9-5+11x

9x-6=4+11x

9x-11x=4+6

-2x=10

x=5

Answer 2

Ответ:

Пошаговое объяснение:

1) (4x - 2) + (5x-4)= 9-(5-11x);

4x - 2 + 5x - 4 = 9 - 5 + 11x

9x - 6 = 4 + 11x

11x - 9x = -6 - 4

2x = -10

x = -10:2

x = -5

2) (7-8x) - (9-12x) + (5x + 4) = -16;

7 - 8x - 9 + 12x + 5x + 4 = -16

2 + 9x = -16

9x = -16 - 2

9x = -18

x = -18:9

x = -2

3) 3(4x - 5)-10(2x - 1) = 33;

12x - 15 - 20x + 10 = 33

-8x - 5 = 33

8x = -5 - 33

8x = -38

x = -38:8

x  = -4,75

4) 9(3(x + 1) - 2x) = 7(x + 1).​

9(3x + 3 - 2x) = 7x + 7

27x + 27 - 18x = 7x + 7

9x + 27 = 7x + 7

9x - 7x = 7 - 27

2x = -20

x = -20:2

x = -10