Question

Tìm x £ z biết 

 A, 2 . ( x - 3 ) + 1 = -25 

 B , | 3 . x + 1 | + 24 = 13

Answer 1

 A, 2 . ( x - 3 ) + 1 = -25 

2.(x-3)=-25-1

2.(x-3)=-26

x-3    =-26:2

x-3    =-13

x=-13+3

x=-10

 B , | 3 . x + 1 | + 24 = 13

|3.x+1|=13-24

|3.x+1|=-11

TH1:

3.x+1=-11

3.x    =-11-1

3.x   =-12

x      =-12:3

x      =-4

TH2:

3.x+1=-(-11)

3.x+1=11

3.x    =11-1

3x=10

x=10/3

vậy x=-4 ;10/3

Answer 2

 a), 2 . ( x - 3 ) + 1 = -25 

2.(x-3)=-25-1

2.(x-3)=-26

x-3    =-26:2

x-3    =-13

x=-13+3

x=-10

  b)| 3 . x + 1 | + 24 = 13

|3.x+1|=13-24

|3.x+1|=-11

TH1:

3.x+1=-11

3.x    =-11-1

3.x   =-12

x      =-12:3

x      =-4

TH2:

3.x+1=-(-11)

3.x+1=11

3.x    =11-1

3x=10

x=10/3

vậy x=-4 ;10/3