Question

2•(2x+5)-15=3
|2x-3|=13
13-2•(2x-5)=-5​

Answer 1

Răspuns:

1) 2*(2x+5)-15=3

4x+10-15=3

4x-5=3

4x=3+5

4x=8 => x=2

2) |2x-3|=13

cazul 1

2x-3=13

2x=13+3

2x=16=>x=8

cazul 2

2x-3=-13

2x=-13+3

2x=-10=> x=-5

S={-5,8}

3) 13-2(2x-5)=-5

13-4x+10=-5

23-4x=-5

-4x=-5-23

-4x=-28 => x=7