Question

Bài 1, 

Answer 1

Bài 1

a) \(2\left(2x-1\right)^3=54\)

= \(\left(2x-1\right)^3=27\)

= \(\left(2x-1\right)^3=3^3\)

=> \(2x-1=3\)

= \(2x=4\)

= \(x=2\)

Vậy x = 2

b) \(2^{x+1}.3=48\)

⇔ \(2^{x+1}=16\)

⇔ \(2^{x+1}=2^4\)

⇔ \(x+1=4\)

⇔ \(x=3\)

Vậy x = 3

c) \(x+3x=2^{11}:2^8+4\)

⇔ \(4x=2^3+4\)

⇔ \(4x=12\)

⇔ \(x=3\)

Vậy x = 3