Question

9x-2.3²=3⁴

Answer 1

`9x-2.3^2=3^4`

`=>9x-2.9 =81`

`=>9x-18 =81`

`=>9x=81+18`

`=>9x=99`

`=>x=99:9`

`=>x=11`

 

Answer 2

\(9x-2\cdot3^2=3^4\)

\(\Leftrightarrow9x-18=81\)

\(\Leftrightarrow9x=63\)

\(\Leftrightarrow x=7\)

Vậy x=7

Answer 3

=>9x=81+18=99

=>x=11

Answer 4

9x-2.3²=3⁴

<=>9x-18=81

<=>9x=81+18

<=>9x=99

<=>x=99:9

<=>x=11

Vậy x=11