Question

I sprawdzenie,prosze o pomc,daje naj ! ;) 1) x + 3 + 2x = 7
2)-4 + 5x - 3 = 6x + 22
3)6 - x + 2x = 8
4) 3 ( y + 2) = 5
5) 3 ( x + 1 ) + 2 = 8
6) 5 ( 2x - 3 ) = 4 ( x-3)
Daje naj

Answer 1

1. 3x = 4        x=1 i 1/3

2. -4-3-22 = 6x-5x              -29 = x

3. x = 2

4. 3y+6 = 5          3y = -1         y = -1/3

5. 3x+3+2 = 8     3x = 3         x = 1

6. 10x -15 = 4x-12          6x = -3            x = -1/2

Answer 2

x + 3 +2x = 7 

3x = 7 - 3 

3x = 4 / :3

x = 1 1/3

spr.

1 1/3 +3 + 2* 1 1/3 = 1 1/3 +3 + 2 2/3 = 7

2 )

-4 +5x - 3 = 6x + 22 

-4 -3 -22 = 6x - 5x 

-29 = x 

spr.

-4 + 5*(-29) - 3 = 6*(-29) +22

-4 + (-145) -3 = -174 + 22

-152 = -152

3)

6 - x + 2x = 8

-x +2x = 8 - 6

x = 2

spr.

6 - 2 + 2 * 2 = 8

4+4 = 8

4)

3 (y + 2) = 5

3y + 6 = 5

3y = 5 -6

3y = -1 /:3

y = - 1/3

spr.

3 (-1/3 + 2) = 5

3 * 1 2/3 = 5

3 * 5/3 = 5

15/3 = 5

5) 

3 (x+1) + 2 = 8

3x + 3 + 2 = 8

3x +5 = 8

3x =8 -5 

3x = 3 /:3

x =1

spr.

3 (1+1) +2 = 8

3*2 +2 =8

6+2 = 8

6)

5 ( 2x - 3 ) = 4 ( x-3) 

10x - 15 = 4x - 12

10x - 4x = -12 +15

6x = 3 / :6

x = 1/2

spr.

5 (2*1/2 - 3) = 4 (1/2 - 3)

5 (1 - 3) = 4 * -2 1/2

5* (-2) = -10