`(-8/25 : 2/15 ) : (-2)/5`
`= (-8/25 xx 15/2) : (-2)/5`
`= -120/50 xx (-5)/2`
`= -12/5 xx (-5)/2`
`=60/10`
`=6`
\(\left(-\dfrac{8}{25}:\dfrac{2}{15}\right):\left(-\dfrac{2}{5}\right)=\left(-\dfrac{8}{25}\times\dfrac{15}{2}\right)\times\left(-\dfrac{5}{2}\right)\)
\(=\left(-\dfrac{120}{50}\right)\times\left(-\dfrac{5}{2}\right)=\left(-\dfrac{12}{5}\right)\times\left(-\dfrac{5}{2}\right)=\dfrac{60}{10}=\dfrac{6}{1}=6\)
\(\left(\dfrac{-8}{25}:\dfrac{2}{15}\right):\dfrac{-2}{5}\\ =\left(\dfrac{-8}{25}\cdot\dfrac{15}{2}\right):\dfrac{-2}{5}\\ =\dfrac{-120}{50}:\dfrac{-2}{5}\\ =\dfrac{-120}{50}\cdot\dfrac{5}{-2}\\ =\dfrac{-600}{-100}\\ =6\)