Question

3.(2x-1)^3-1^2020=5.4^2

Answer 1

3.(2x-1)^3-1^2020=5.4^2

3.(2x-1)^3-1^2020=5.16

3.(2x-1)^3-1^2020=80

3.(2x-1)^3-1=80

3.(2x-1)^3   =80+1

3.(2x-1)^3   =81

    (2x-1)^3  =81 : 3

    (2x-1)^3  = 27

=> (2x-1)^3  = 3^3

=>  2x-1=3

      2x    =3+1

      2x    =4

        x    = 4:2

        x    = 2

 vậy x=2

Answer 2

\(3.\left(2x-1\right)^3-1^{2020}=5.4^2\\ 3.\left(2x-1\right)^3-1=80\\ 3.\left(2x-1\right)^3=80+1\\ 3.\left(2x-1\right)^3=81\\ \left(2x-1\right)^3=81:3\\ \left(2x-1\right)^3=27\\ \left(2x-1\right)^3=3^3\\ 2x-1=3\\ 2x=3+1\\ 2x=4\\ x=4:2\\ x=2\)