Question

Tìm x

2x.(x-1/7)=0

Answer 1

`2x.(x-1/7)=0`

\(\Rightarrow\left[{}\begin{matrix}2x=0\\x-\dfrac{1}{7}=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=0:2\\x=0+\dfrac{1}{7}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{1}{7}\end{matrix}\right.\)

vậy \(x\in\left\{0;\dfrac{1}{7}\right\}\)

Answer 2

`2x(x-1/7) =0`

`<=>` \(\left[{}\begin{matrix}x=0\\x=\dfrac{1}{7}\end{matrix}\right.\)