Question

tìm x biết

\(2x\cdot\left(x-\frac{1}{7}\right)=0\)

Answer 1

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

Vậy...

Answer 2

\(2x.\left(x-\frac{1}{7}\right)=0\)

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

Vậy \(x\in\left\{0;\frac{1}{7}\right\}.\)

Chúc bạn học tốt!