a: \(\left[\left(\dfrac{3}{8}-\dfrac{5}{3}\right)\cdot\left|6\right|+\left(\dfrac{1}{2}\right)^2\right]\cdot\sqrt{81}-0,5\)
\(=\left[\dfrac{9-40}{24}\cdot6+\dfrac{1}{4}\right]\cdot9-0,5\)
\(=\left(-\dfrac{31}{4}+\dfrac{1}{4}\right)\cdot9-0,5\)
\(=-\dfrac{30}{4}\cdot9-0,5\)
\(=-\dfrac{270}{4}-0,5=-67,5-0,5=-68\)
b: \(0,6+\dfrac{1}{-2}-\dfrac{3}{5}\)
\(=0,6-0,5-0,6\)
=-0,5
c: \(\left|-\dfrac{3}{21}\right|\cdot\left(-1\right)^{2016}+\dfrac{2}{3}\)
\(=\dfrac{1}{7}\cdot1+\dfrac{2}{3}\)
\(=\dfrac{1}{7}+\dfrac{2}{3}=\dfrac{3}{21}+\dfrac{14}{21}=\dfrac{17}{21}\)
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