\(\dfrac{-6}{25}+\left|\dfrac{-4}{5}\right|-\left|\dfrac{2}{25}\right|\)
\(=\dfrac{-6}{25}+\dfrac{4}{5}-\dfrac{2}{25}\)
\(=\dfrac{-6}{25}+\dfrac{20}{25}-\dfrac{2}{25}\)
\(=\dfrac{12}{25}\)
b) \(\dfrac{5}{9}-\left|\dfrac{4}{9}\right|+\left|\dfrac{8}{5}\right|\)
\(=\dfrac{5}{9}-\dfrac{4}{9}+\dfrac{8}{5}\)
\(=\dfrac{1}{9}+\dfrac{8}{5}\)
\(=\dfrac{5}{45}+\dfrac{72}{45}\)
\(=\dfrac{77}{45}\)