Question

Tìm x biết

9x-2:3^2=3^4

 

Answer 1

\(\Leftrightarrow9x=81+\dfrac{2}{9}=\dfrac{731}{9}\\ \Leftrightarrow x=\dfrac{731}{81}\)

Answer 2

9x-2:3²=3⁴

9x-2=3⁶

9x-2=729

9x=729+2

9x=731

x=81,2

Answer 3

9x-2:9=81
9x-2/9=81
9x      =81+2/9
9x      =729/9+2/9
9x      =    731/9
x        =731/9:9
x        =731/9 x 1/9
x        =    731/81