there is - there are - there are - there is - there are - there is - there is - there are - there is - there is - there are - there is - there is - there are - there is

13x - 12 = 5 x 5

13x - 12 = 25

13x = 25 + 12

13x = 37

x = 37 : 13

x = 37/13

\(\Leftrightarrow\left(x-\dfrac{1}{4}\right)^2=\left(\dfrac{2}{3}\right)^2\) 

\(\Leftrightarrow x-\dfrac{1}{4}=\pm\dfrac{2}{3}\) 

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{1}{4}=\dfrac{2}{3}\\x-\dfrac{1}{4}=-\dfrac{2}{3}\end{matrix}\right.\) 

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{4}+\dfrac{2}{3}=\dfrac{11}{12}\\x=\dfrac{1}{4}+\left(-\dfrac{2}{3}\right)=-\dfrac{5}{12}\end{matrix}\right.\) 

Vậy ..

=((( chậm mà