Question

tim x (x-3).(3x-9)=0

Answer 1

\(\left(x-3\right)\left(3x-9\right)=0\)

\(\Rightarrow\hept{\begin{cases}x-3=0\\3x-9=0\end{cases}}\Rightarrow\hept{\begin{cases}x=3\\x=3\end{cases}}\)

Vậy x = 3

Answer 2

x(x-3).(3x-9)=0

x(x-3).3(x-3)=0

(x-3)(x-3)=0

(x-3)^2=0

x-3=0

x=3

Answer 3

x(x-3)(3x-9)=0

Suy ra x=0 hoặc x-3=0 

x-3=0 suy ra x=3