Question

Giúp mình với!

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

Answer 1

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

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

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=\frac{1}{7}\end{array}\right.\)

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

Answer 2

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

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

        Vậy x=0

               x=\(\frac{1}{7}\)

Answer 3

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

\(\Rightarrow\begin{cases}2x=0\\x-\frac{1}{7}=0\end{cases}\Rightarrow\begin{cases}x=0\\x=\frac{1}{7}\end{cases}\)