Question

помогите ппжпжжппж срочно​

Answer 1

Ответ:

Пошаговое объяснение:

7x + 10 = 5x + 2

7x - 5x = 2 - 10

2x  = -8

x = -8:2

x = -4

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4(3x - 2) + 5 = 9

12x - 8 + 5 = 9

12x - 3 = 9

12x = 9+3

12x = 12

x = 12:12

x = 1

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2x - 5 = 7(3x + 4) + 5

2x - 5 = 21x + 28 + 5

2x - 5 = 21x + 33

21x - 2x = -5 - 33

19x = -38

x = -38:19

x = -2

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28 - 4(3x + 2) = 5(2x - 7)

28 - 12x - 8 = 10x - 35

20 - 12x = 10x - 35

10x + 12x = 20 + 35

22x = 55

x = 55 : 22

x = 2,5

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3x - 4(5x + 2) - 6(3x - 4) = 1

3x - 20x - 8 - 18x + 24 = 1

-35x + 16 = 1

35x = 16-1

35x = 15

x = 15:35

x = 3/7

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

7x - 28 + 3 = 6x - 21 + x - 8

7x - 25 = 7x - 29

7x - 7x = -29 + 25

0 = -4

x  ≠ -4 (уравнение не имеет корней)

======================бонусом

ВАРИАНТ З

1.

5-6x=-10x-3

10x - 6x = -3 - 5

4x = -8

x = -8:4

x = -2

2.

6(2x+5)-8x=2

12x + 30 - 8x = 2

4x + 30 = 2

4x = 2 - 30

4x = -28

x = -28 : 4

x = -7

3.

3 + 4(5x-3) = 4x+7

3 + 20x - 12 = 4x + 7

20x - 9 = 4x + 7

20x - 4x = 7+9

16x = 16

x = 16:16

x = 1

4.

3(5x-7)-7(4x+5) = x

15x - 21 - 28x - 35 = x

-13x - 56 = x

13x+x = -56

14x = -56

x = -56:14

x = -4

5.

2(6x-5)-7(3x - 5) = 4x-1

12x - 10 - 21x + 35 = 4x - 1

-9x + 25 = 4x - 1

4x + 9x = 25 + 1

13x = 26

x = 26:13

x = 2

6.

−12x+4(x − 3) = − 8x − 12.

-12x + 4x - 12 = -8x - 12

-8x - 12 = -8x - 12

8x - 8x = 12 - 12

0 = 0

x  є (-∞ ; ∞) (уравнение имеет множество решений)