Question

( 5 - 7x) ( \(\dfrac{3}{7}\) - 3x ) = 0 (Hai trường hợp)

Answer 1

\(\left(5-7x\right)\left(\dfrac{3}{7}-3x\right)=0\)

\(=>\left\{{}\begin{matrix}5-7x=0\\\dfrac{3}{7}-3x=0\end{matrix}\right.=>\left\{{}\begin{matrix}x=\dfrac{5}{7}\\x=\dfrac{1}{7}\end{matrix}\right.\)

 

Answer 2

\(\left(5-7x\right)\left(\dfrac{3}{7}-3x\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}5-7x=0\\\dfrac{3}{7}-3x=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}7x=5\\3x=\dfrac{3}{7}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{5}{7}\\x=\dfrac{1}{7}\end{matrix}\right.\)

Vậy x = \(\dfrac{5}{7}\) hoặc x=\(\dfrac{1}{7}\)