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

\(\Rightarrow5x\left(x-2000\right)-\left(x-2000\right)=0\\ \Rightarrow\left(x-2000\right)\left(5x-1\right)=0\)

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

Ai giúp minh làm bài 5 phía trên với

a/ (do (x-3)^2 + 1 ≠0 vs mọi x

a) (x-3)³-3+x=0

=> (x-3)³+(x-3)=0

=> (x-3)(x²-6x+10)

=> \(\left[{}\begin{matrix}x-3=0\\x^2-6x+10=0\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x=3\\\left(x-3\right)^2=1\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x=3\\x=4\\x=2\end{matrix}\right.\)

5x(x – 2000) – x + 2000 = 0

⇔ 5x(x – 2000) – (x – 2000) = 0

(Có x – 2000 là nhân tử chung)

⇔ (x – 2000).(5x – 1) = 0

⇔ x – 2000 = 0 hoặc 5x – 1 = 0

+ x – 2000 = 0 ⇔ x = 2000

+ 5x – 1 = 0 ⇔ 5x = 1 ⇔ x = 1/5.

Vậy có hai giá trị của x thỏa mãn là x = 2000 và x = 1/5.

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.

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

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

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

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

Vậy x=2000 hoặc x=\(\frac{1}{5}\)

Ta có:

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

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

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

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

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

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

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

x -2000 = 0=> x=2000

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

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

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

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

hoặc 5x - 1 = 0 => 5x = 1 => x = 1/5

Vậy x = 2000; x = 1/5

Supper Saydan Goku

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

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

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

<=>5x-1=0 hoặc x-2000=0

<=>5x=1 hoặc x=2000

5x=1,Mà x>1 =>loại

=>x=2000

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

5.x - 10000 - x + 2000 = 0

5x - 10000 - x = -2000

4x = -2000 + 10000

4x = 8000

x = 2000 

x=2000 chắc chắn 100%

tick minh nha