Question

( 4x - 1 )³ = 27.125

Answer 1

\(\left(4x-1\right)^3=27.125\)

`=>(4x-1)^3=3^3.5^3`

`=>(4x-1)^3=(3.5)^3`

`=>4x-1=3.5`

`=>4x-1=15`

`=>4x=16`

`=>x=4`

Answer 2

\(\left(4x-1\right)^3=3375\)

\(\left(4x-1\right)^3=15^3\)

\(4x-1=15\)

\(4x=16\)

\(\Rightarrow x=4\)

Answer 3

=>(4x-1)³=3375

=>(4x-1)³=15³

=>4x-1=15

=>4x=15+1

=>4x=16

=>x=16:4

=x=4

Vậy x=4

Answer 4

\(\left(4x-1\right)^3=27.125\)

\(\left(4x-1\right)^3=3^3.5^3\)

\(\left(4x-1\right)^3=15^3\)

\(4x-1=15\)

\(4x=15+1\)

\(4x=16\)

\(x=\dfrac{16}{4}\)

\(x=4\)

Vậy \(x=4\)