Question

a) 17/8 : (27/8 + -11/2) 

b) 7,63 . 21,15 + 7,63 . ( -121,15)

c) [ -5/24 - 0,75 ] : [-2\(\dfrac{7}{8}\)

giup mik nha 

Answer 1

a) \(\dfrac{17}{8}:\left(\dfrac{27}{8}+\dfrac{-11}{2}\right)\)

\(=\dfrac{17}{8}.\dfrac{-8}{17}\)

\(=-1\)

b) \(7,63.21,15+7,63.\left(-121,15\right)\)

\(=7,63.\left(21,15-121,15\right)\)

\(=7,63.\left(-100\right)\)

\(=-763\)

c) \(\left(-\dfrac{5}{24}-0,75\right):\left(-2\dfrac{7}{8}\right)\)

\(=\left(-\dfrac{5}{24}-\dfrac{3}{4}\right):\left(-\dfrac{7}{4}\right)\)

\(=\dfrac{-23}{24}.\dfrac{-4}{7}\)

\(=\dfrac{23}{42}\).

 

Answer 2

\(a.\dfrac{17}{8}:\left(\dfrac{27}{8}+\dfrac{-11}{2}\right)\text{=}\dfrac{17}{8}:\dfrac{-17}{8}\text{=}-1\)

\(b.7,63.21,15+7,63.-121,15\text{=}7,63.\left(21,15-121,15\right)\text{=}7,63.-100\text{=}-763\)

\(c.\left(\dfrac{-5}{24}-0,75\right):\dfrac{-23}{8}\text{=}\dfrac{-23}{24}.\dfrac{-8}{23}\text{=}\dfrac{1}{3}\)