Question

Tính :

\(\left(-0,5-\frac{3}{5}\right):\left(-\frac{22}{25}\right)+\left(\frac{2}{25}-1,08\right)\times\frac{3}{8}-72:12^2\)

Answer 1

\(\left(-0,5-\dfrac{3}{5}\right):\left(\dfrac{-22}{25}\right)+\left(\dfrac{2}{25}-1,08\right).\dfrac{3}{8}-72:12^2\)

\(=\left(\dfrac{-1}{2}-\dfrac{3}{5}\right):\left(\dfrac{-22}{25}\right)+\left(\dfrac{2}{25}-\dfrac{27}{25}\right).\dfrac{3}{8}-\dfrac{72}{144}\)

\(=\left[\dfrac{-11}{10}.\dfrac{-25}{22}\right]-1.\dfrac{3}{8}-\dfrac{1}{2}\)

\(=\dfrac{5}{4}-\dfrac{3}{8}-\dfrac{1}{2}\)

\(=\dfrac{10}{8}-\dfrac{3}{8}-\dfrac{4}{8}\)

\(=\dfrac{3}{8}\)