Question

Tìm x bt :

5x ( x - 2000 ) - x + 2000 = 0

Answer 1

\(5x\left(x-2000\right)-x+2000=0\)

\(\Rightarrow5x\left(x-2000\right)-\left(x-2000\right)=0\)

\(\Rightarrow\left(5x-1\right)\left(x-2000\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}5x-1=0\\x-2000=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{5}\\x=2000\end{matrix}\right.\).

Answer 2

\(5x\left(x-2000\right)-x+2000=0\)

\(\Leftrightarrow5x\left(x-2000\right)-\left(x-2000\right)=0\)

\(\Leftrightarrow\left(x-2000\right)\left(5x-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2000=0\Rightarrow x=2000\\5x-1=0\Rightarrow x=\dfrac{1}{5}\end{matrix}\right.\)