Question

Rozwiaz rownanie A) 2x-1/2 (3x-2)= 7/4 -x B) 3x-2 (1-2x) = 0,5 (3x+1,5) C) 3 1/3x +8= 4 2/5x -8 D) x/2 + x/4 + x/5 = x-1 Z gory dziekuje :)

Answer 1

a)

2x-1/2(3x-2)=7/4-x

2x-1 1/2x+1=1  3/4 - x

2x-1  1/2x+x=1 3/4 -1

1 1/2x=3/4

3/2 x = 3/4

x=3/4 * 2/3

x=1/2

b)

3x-2(1-2x)=0,5(3x+1,5)

3x-2+4x=1,5x+0,75

3x+4x-1,5x=0,75+2

5,5x=2,75

x=0,5

 

c)

3 1/3x+8=4 2/5x-8

10/3x-22/5x=-8-8

50/15x-66/15x=-16

-16/15x=-16

x=-16 * (-15/16)

x=15

d)

x/2+x/4+x/5=x-1  / * 20

10x+5x+4x=20x-20

10x+5x+4x-20x=-20

-x=-20

x=20