Question

2x.(x-1/7)=0 ( dấu chấm là nhân nha)

Answer 1

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

\(\Rightarrow2x\text{ hoặc }x-\dfrac{1}{7}=0\)

+ Nếu 2x = 0 thì x = 0

+ Nếu x - \(\dfrac{1}{7}\) = 0 thì x = \(\dfrac{1}{7}\)

Vậy...

Answer 2

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

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

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

Vậy \(x=0\) hoặc \(x=\dfrac{1}{7}\)

Answer 3

=>2x=0 hoặc x-\(\dfrac{1}{7}\)=0

=>x=0:2 hoặc x=0+\(\dfrac{1}{7}\)

=>x=0 hoặc x=\(\dfrac{1}{7}\)