Question

Решить уравнения. Даю 70 баллов!

Answer 1

Ответ:

1)6x+8=-28

6x=-36

x=-6

2)6x+21=27

6x=6

x=6

3)5-3x-8x+2=40

-11x=40-5-2

-11x=33

x=-3

4)7-2x-15x+6=47

-17x=47-7-6

-17x=34

x=-2

5)14(2-x)=7(3+x)

28-14x=21+7x

-21x=-7

x=1/3 (дробь)

6)15(7-x)=5(2+x)

105-15x=10+5x

-20x=-95

x=4.75

Объяснение:

Answer 2

2 × (3x + 4) = - 28

3x + 4 = - 14

3x = - 14 - 4

3x = - 18

x = - 6

3 × (2x + 7) = 27

2x + 7 = 9

2x = 9 - 7

2x = 2

x = 1

5x - 3x - 2 × (4x - 1) = 40

5x - 3x - 8x + 2 = 40

7 - 11x = 40

- 11x = 40 - 7

- 11x = 33

x = - 3

7 - 2x - 3 × (5x - 2) = 47

7 - 2x - 15x + 6 = 47

13 - 17x = 47

- 17x = 47 - 13

- 17x = 34

x = - 2

2 - x / 7 = 3 + x / 14

14 (2 - x) = 7 (3 + x)

28 - 14x = 21 + 7x

- 14x - 7x = 21 - 28

- 21x = - 7

x = 1/3

7 - x / 5 = 2 + x / 15

15 (7 - x) = 5 (2 + x)

105 - 15x = 10 + 5x

- 15x - 5x = 10 - 105

- 20x = - 95

x = 19/4