Question

Ajutati va rog la rezolvare
|x-13|=8 ; |2x+4|-5x=3 ;|x|+2•|x-2|=7
Dau coroana

Answer 1

a)|x-13|=8

x-13=8

-(x-13)=8

x=8+13=21

-x+13=8

13-x=8

-x=8-13=-5

x=5

b)|2x+4|-5x=3

(2x+4)-5x=3

-(2x+4)-5x=3

2x+4-5x=3

-3x+4=3

-3x=3-4=-1

$x = \frac{ - 1}{ - 3} = \frac{1}{3}$

-2x-4-5x=3

-7x-4=3

-7x=3+4=7

x=-1 (Nu este soluție.)