Question

-0,07(10x-1)=0,3x

proszę rozwiązać muszę sprawdzić wynik

a reszta zadań w załączniku

Daję NAJ

Answer 1

-0,07(10x-1)=0,3x

-0,7x+0,07 = 0,3x

x=0,07

 

2)

1- (3x-88)/7=5x

1-3x-88=35x

-87 = 38x

x= -87/38 = - 2 11/38

3)

-x/2 = 3x - (3x+2)/4

-4x/2 = 3x - 3x + 2

-2x = 2

x=-4

4)

(3-2x)/5+8 = (5x+2)/2 - x

(3-2x)/5 = (5x+2)/2 - x - 8

3-2x = 25x+10/2 - 5x - 40

3-2x = 12,5x + 5 - 5x -40

3- 2x = 7,5x -35

9,5x=38

x = 4

5)

2x-11 / 4 + 19 - 2x /2 =2x

2x-11 +19 - 2x /2 = 8x

2x - 11 + 19 - 2x = 16x

16x = 8

x = 1/2

Answer 2

-0,07(10x-1)=0,3x

- 0,7x + 0,07 = 0,3x

- 0,7x - 0,3x = - 0,07

- x = - 0,07

x = 0,07

 

1 - (3x - 88)/7 = 5x

7 -3x + 88 = 35x

35x + 3x = 88 + 7

38x = 95

x =95/38 = 2 i 19/38 = 2 i 1/2

 

- x/2 = 3x - (3 + 2x)/4

- 2x = 12x - 3 - 2x

- 2x + 2x - 12x = - 3

- 12x = -3

x = 3/12 = 1/4

 

3 - 3x/2 = 5/8 - (4x - 3)/6

72 - 36x = 20 - 16x + 12

- 36x + 16x = 20 + 12 - 72

- 20x = - 40

x = 40/20 = 2

 

(3 - 2x)/5 + 8 = (5x + 2)/2 - x

2(3 - 2x) + 80 = 5(5x + 2) - 10x

6 - 4x + 80 = 25x + 10 - 10x

- 4x - 25x + 10x = 10 - 80 - 6

- 19x = - 76

x = 76/19 = 4

 

(2x - 11)/4 + (19 - 2x)/2 = 2x

2x - 11 + 38 - 4x = 8x

2x - 4x - 8x = 11 - 38

- 10x = - 27

x = 27/10 = 2 i 7/10

 

1 - [ (x - 2)/4 + 2/3] = x

1 - [ (3x - 6 + 8)/12] = x

1 - (3x + 2)/12 = x

12 - 3x - 2 = 12x

- 3x - 12x = - 12 + 2

- 15x = - 10

x = 10/15 = 2/3