Question

помогите пожалуйста решить 10 примеров из этого списка​

Answer 1

3x - 1 = 2 · ( x - 2 )

3x - 1 = 2x - 4

3x - 2x = 1 - 4

x = -3

3 · (x + 5) = 7 - 5x

3x + 15 = 7 - 5x

3x + 5x = 7 - 15

8x = -8

x = $\frac{-8}{8}$

x = -1

19(y - 9) = 3(y - 8)

19y - 171 = 3y - 24

19y - 3y = 171 - 24

16y = 147

y = $\frac{147}{16}$

y = 9,1875

4 · (x - 9) = 3 · (x - 8)

4x - 36 = 3x - 24

4x - 3x = 36 - 24

x = 12

3 · (2x - 9) = 5 · (x - 4)

6x - 27 = 5x - 20

6x - 5x = 27- 20

x = 7

7 · (3 - 2x) = 15 · (1 - x)

21 - 14x = 15 - 15x

15x - 14x = 15 - 21

x = -6

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

7x - 3 - 2x = x + 9

7x - 2x - x = 9 + 3

4x = 12

x = $\frac{12}{4}$

x = 3

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

13 - 2x + 5 = x - 3

-2x - x = - 3 - 13 - 5

-3x = -21

x = $\frac{-21}{-3}$

x = 7

5 - (1$\frac{1}{2}$x + $\frac{1}{3}$)6 = 2$\frac{1}{3}$x - 5$\frac{1}{2}$

5 - 9x - 2 = 2$\frac{1}{3}$x - 5$\frac{1}{2}$

-9x - 2$\frac{1}{3}$x = 2 - 5 - 5$\frac{1}{2}$

-11$\frac{1}{3}$x = -8,5

x = -8,5 ÷ -11$\frac{1}{3}$

x = 0,75

3$\frac{1}{5}$ · (3x - 1) - 2,5x = 6$\frac{1}{2}$x +2,5

9$\frac{3}{5}$x - 3$\frac{1}{5}$ - 2,5x = 6$\frac{1}{2}$x +2,5

9$\frac{3}{5}$x - 2,5x -  6$\frac{1}{2}$x = 2,5 + 3$\frac{1}{5}$

0,6x = 5,7

x = $\frac{5,7}{0,6}$

x = 9,5