a.
\(\left(-3,2\right).\dfrac{-15}{64}+\left(0,8-2\dfrac{4}{15}\right):1\dfrac{23}{24}\)
= \(-3,2.\dfrac{-15}{64}+0,8-\dfrac{34}{15}:\dfrac{47}{24}\)
= \(\dfrac{\left(3,2.\dfrac{15}{64}+0,8-\dfrac{34}{15}\right).24}{47}\)
= \(\dfrac{24\left(\dfrac{-34}{15}+0,75+0,8\right)}{47}=\dfrac{24.\left(\dfrac{-34}{15}+1,55\right)}{47}\)
= \(0,51063...\left(\dfrac{-34}{15}+1,55\right)\)= 0,51063... . -0,71666...
= -0,36595...
b.
= \(\dfrac{\dfrac{28}{15}.0,5^2.3+\left(\dfrac{8}{15}-\dfrac{79}{60}\right)}{\dfrac{47}{24}}=\dfrac{0,75.\dfrac{28}{15}+\dfrac{8}{15}-\dfrac{79}{60}}{\dfrac{47}{24}}\)
= \(\dfrac{\left(0,75.\dfrac{28}{15}+\dfrac{8}{15}-\dfrac{79}{60}\right).24}{47}=\dfrac{24.\left(1,4+\dfrac{8}{15}-\dfrac{79}{60}\right)}{47}\)
= \(\dfrac{24.\left(\dfrac{-47}{60}+1,4\right)}{47}=0,51063...\left(\dfrac{-47}{60}+1,4\right)\)
= \(0,51063...\times0,61666...=0,31489...\)
