Question

кто 1 ответит полностью тому 20баллов​

Answer 1

Ответ:

Пошаговое объяснение:

1)

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

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

x - 1 = 8x + 6

8x - x = -1 - 6

7x = -7

x = -1

===============

2)

7*(2x+1) -6*(3x+1) = 2*42

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) = 6*6

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) = 5*14

4x² + 5x + 20 - 4x² = 70

5x + 20 = 70

5x = 70 - 20

5x = 50

x = 50:5

x = 10