Question

1. Tìm x biết rằng:

a, | 4x -1| = |2x+3|

b,|x -1 | +5x=1

Answer 1

1. Tìm x biết rằng:

| 4x -1| = |2x+3|

TH1: 4x - 1 = 2x + 3

4x - 2x = 3 + 1

2x = 4

x = 4 : 2

x = 2

TH2: 4x - 1 = - (2x + 3)

4x - 1 = -2x- 3

4x + 2x = -3+1

6x = -2

x = -2 : 6

x =\(\dfrac{-2}{6}\)

Answer 2

TH1: 4x - 1 = 2x + 3

4x - 2x = 3 + 1

2x = 4

x = 4 : 2

x = 2

TH2: 4x - 1 = - (2x + 3)

4x - 1 = -2x- 3

4x + 2x = -3+1

6x = -2

x = -2 : 6

x =