a) 8x(x-2013)-(x-2013)=0
\(\Leftrightarrow\left(x-2013\right)\left(8x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=2013\\x=\dfrac{1}{8}\end{matrix}\right.\)
8x(x - 2013) - x + 2013 = 0
⇔ 8x(x - 2013) - (x - 2013) = 0
⇔ (x - 2013)(8x - 1) = 0
⇔ x - 2013 = 0 hoặc 8x - 1 = 0
⇔ x = 2013 hoặc x = \(\dfrac{1}{8}\)