\(\left(80-x\right)\left(2x-4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}80-x=0\\2x-4=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=80\\x=2\end{cases}}\)
tíc mình nha
\(\left(80-x\right)\left(2x-4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}80-x=0\\2x-4=0\end{cases}\Rightarrow\orbr{\begin{cases}x=80\\x=2\end{cases}}}\)