Question

1.rozwiąż i sprawdz:

3x+8=12+7x-4
2.rozwiąż:
a)2x-3*(5-x=5*(x-2)-5
b)5x-x-1/3=x/2-1

Answer 1

Zad1

3x+8=12+7x-4

3x-7x=-8-4

-4x=-12/:(-4)

x=3

 

Zad2

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

2x-15+3x=5x-10-5

2x+3x-5x=15-10-5

0=0

 

b)5x(-x-1)/3=x/2-1  /:6

30x-6x-6=3x-6

30x-6x-3x=6-6

21x=0

x=0/21

Answer 2

3x - 7x = 12 -4 -8

-4x = 0

x = 0

Spr.

3*0 + 8 = 12 +7*0 -4

0 + 8 = 12 + 0 - 4

8 = 8

L = P

 

 

2.

a  2x -15+3x = 5x -10 -5

5x - 5x  = -15 + 15

0  =  0

 

b  5x - x -1/3= x/2 - 1  /*6

30x -6x -2 = 3x -6

24x -3x = -6 + 2

21 x = -4 /21

x = - 4/21