Cái này là GTLN nha
Do \(-\left|3x-\dfrac{1}{4}\right|\le0\)
\(\Rightarrow D=-\left|3x-\dfrac{1}{3}\right|-\dfrac{1}{2}\le-\dfrac{1}{2}\)
\(maxD=-\dfrac{1}{2}\Leftrightarrow x=\dfrac{1}{12}\)
ta có:
\(-\left|3x-\dfrac{1}{4}\right|\) ≤ 0
=> \(-\left|3x-\dfrac{1}{4}\right|\)≤-1/2
GTNN:D= -1/2 khi 3x-1/4=0
3x=1/4
x=1/12