Question

(x-2021)(5x-4)=0

Answer 1

(x-2021)(5x-4)=0

\(< =>x-2021=0;5x-4=0\)

\(< =>x=2021;x=\dfrac{4}{5}\)

Vậy tập nghiệm....

Answer 2

`(x-2021)(5x-4)=0`
`<=>` $\left[ \begin{array}{l}x-2021=0\\5x-4=0\end{array} \right.$
`<=>` $\left[ \begin{array}{l}x=2021\\5x=4\end{array} \right.$
`<=>` $\left[ \begin{array}{l}x=2021\\x=\dfrac{4}{5}\end{array} \right.$