Question

Tìm x, biết:

 (3x – 4) mũ 3 = 125

Answer 1

\(\Leftrightarrow\left(3x-4\right)^3=5^3\\ \Leftrightarrow3x-4=5\\ \Leftrightarrow3x=9\\ \Leftrightarrow x=3\)

Answer 2

\(\left(3x-4\right)^3=125\)

\(\Leftrightarrow\left(3x-4\right)^3=5^3\)

\(\Rightarrow3x-4=5\Leftrightarrow3x=9\Leftrightarrow x=3\)

Answer 3

=> (3x - 4)^3 = 5^3

=> 3x - 4 = 5

=> 3x = 5 + 4

=> 3x = 9

=> x = 9 : 3

=> x = 3

Answer 4

    \(\left(3x-4\right)^3=125\)

⇔\(\left(3x-4\right)^3=5^3\)

⇔\(3x-4=5\)

⇒\(3x=5+4\)

    \(3x=9\)

      \(x=9:3\)

     \(x=3\)

  Vậy \(x=3\)