\(\dfrac{1}{3}-\left[\dfrac{2}{3}-\left(0,5-\dfrac{3}{4}\right)^2\right]\)
\(=\dfrac{1}{3}-\left[\dfrac{2}{3}-\left(\dfrac{1}{2}-\dfrac{3}{4}\right)^2\right]\)
\(=\dfrac{1}{3}-\left[\dfrac{2}{3}-\left(\dfrac{2}{4}-\dfrac{3}{4}\right)^2\right]\)
\(=\dfrac{1}{3}-\left[\dfrac{2}{3}-\left(-\dfrac{1}{4}\right)^2\right]\)
\(=\dfrac{1}{3}-\left(\dfrac{2}{3}-\dfrac{1}{16}\right)\)
\(=\dfrac{1}{3}-\dfrac{29}{48}\)
\(=-\dfrac{13}{48}\)
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