` ( 1 + 2/3 - 1/4) . ( 4/5 - 3/4)^2`
`= ( 1 + 2/3 - 1/4) . ( 16/20 - 15/20)^2`
`= ( 1 + 2/3 - 1/4) . (1/20)^2`
`=( 1 + 2/3 - 1/4) . 1/400`
`= ( 12/12 + 8/12 - 3/12) . 1/400`
`= 17/12 . 1/400`
`= 17/4800`
___________________________________
`2 : ( 1/2 - 2/3)^3`
`= 2 : ( 3/6 - 4/6)^3`
` = 2 : (-1/6)^3`
`=2 : (-1)/216`
`= 2 xx (-216)`
`= -432`
\(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right).\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\\ =\dfrac{12}{12}+\dfrac{8}{12}-\dfrac{3}{12}.\dfrac{1}{400}\\ =\dfrac{17}{12}.\dfrac{1}{400}\\ =\dfrac{17}{4800}\)
\(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)^3\\= 2:-\dfrac{1}{216}\\ =2.-216\\ =-432\)
a) \(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right).\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\)
\(=\dfrac{17}{12}.\left(\dfrac{1}{20}\right)^2\)
\(=\dfrac{17}{12}.\dfrac{1}{400}\)
\(=\dfrac{17}{4800}\)
b) \(2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)^3\)
\(=2:\left(-\dfrac{1}{6}\right)^3\)
\(=2:\left(-\dfrac{1}{216}\right)\)
\(=-432\)
