Question

Answer 1

|2x - 1| - 1/2 = 1/3

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

|2x - 1| = 5/6

2x - 1 = 5/6 hoặc 2x - 1 = -5/6

*) 2x - 1 = 5/6

2x = 5/6 + 1

2x = 11/6

x = 11/6 : 2

x = 11/12

*) 2x - 1 = -5/6

2x = -5/6 + 1

2x = 1/6

x = 1/6 : 2

x = 1/12

Vậy x = 11/12; x = 1/6

Answer 2

2/5 x - 1/3 = 2/3

2/5 x = 2/3 + 1/3

2/5 x = 1

x = 1 : 2/5

x = 5/2

Answer 3

(1/5)²ˣ⁻³ = 1/625

(1/5)²ˣ⁻³ = (1/5)⁴

2x - 3 = 4

2x = 4 + 3

2x = 7

x = 7/2

Answer 4

ĐKXĐ: x ≤ 19/5

7 - √(19 - 5x) = 4

√(19 - 5x) = 7 - 4

√(19 - 5x) = 3

19 - 5x = 9

5x = 19 - 9

5x = 10

x = 10 : 5

x = 2 (nhận)

Vậy x = 2

Answer 5