Question

Tìm x biết:5x*(x-2000)-x+2000=0

Answer 1

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

=> 5x.(x-2000)-(x-2000)=0

=> (x-2000)-(5x-1)=0

=> x-2000=0 => x=2000

Hoặc 

=> 5x-1=0 => 5x=1 => x=1:5 => x=1/5

Vậy x=2000 hoặc x=1/5.

Answer 2

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

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

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

\(\orbr{\begin{cases}x-2000=0\\5x-1=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=2000\\x=\frac{1}{5}\end{cases}}\)

Vậy x=2000 hoặc x=\(\frac{1}{5}\)