Question

Помогите пж
Даю 20 баллов

Answer 1

Ответ:

1) 8x - (7x + 1) = 2(4x + 3)

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

x - 1 = 8x + 6

x - 8x = 6 + 1

-7x = 7

x = 7 ÷ (-7)

x = -1

2) 7(2x + 1) - 6(3x + 1) = 84

14x + 7 - 18x - 6 = 84

-4x + 1 = 84

-4x = 84 - 1

-4x = 83

x = 83 ÷ (-4)

x = -20,75

3) 2(2x + 3) - (5x + 13) + 3(5 - 2x) = 36

4x + 6 - 5x - 13 + 15 - 6x = 36

-7x + 8 = 36

-7x = 36 - 8

-7x = 28

x = 28 ÷ (-7)

x = -4

4) 4x² + 5x + 2(10 - 2x²) = 70

4x² + 5x + 20 - 4x² = 70

5x + 20 = 70

5x = 70 - 20

5x = 50

x = 50 ÷ 5

x = 10