ảnh bia đậm chất sạt gơ=))

`2(x-3)-4x=0`

`<=> 2x-6-4x=0`

`<=> -2x-6=0`

`<=>-2x=6`

`<=>x=-3`

__

`x^2-2x+1=25`

`<=>(x-1)^2=25`

`<=> (x-1)^2 = (+- 5)^2`

\(\Leftrightarrow\left[{}\begin{matrix}x-1=5\\x-1=-5\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\)

Chời, xịn quaaa eiu oiiiiiii  👉👈🙆

\(\dfrac{5xy}{10x}=\dfrac{5xy:5x}{10x:5x}=\dfrac{y}{2}\\ \dfrac{2x+2}{x^2-1}=\dfrac{2\left(x+1\right)}{\left(x-1\right)\left(x+1\right)}=\dfrac{2}{x-1}\\ \dfrac{x+3}{6x+18}=\dfrac{x+3}{6\left(x+3\right)}=\dfrac{1}{6}\)