Question

 Giải thành các bước

Answer 1

\(=2\dfrac{6}{7}.\left[\left(\dfrac{-7}{5}-\dfrac{6}{5}\right)+\left(\dfrac{3}{2}\right)^2\right]\)

\(=2\dfrac{6}{7}.\left[\dfrac{-13}{5}+\dfrac{9}{4}\right]\)

\(=2\dfrac{6}{7}.\dfrac{-7}{20}\)

=\(=\dfrac{20}{7}.\dfrac{-17}{20}=\dfrac{-17}{7}\)

 

Answer 2

\(2\dfrac{6}{7}.\left[\left(\dfrac{-7}{5}-\dfrac{3}{2}:\dfrac{-5}{-4}\right)+\left(\dfrac{3}{2}\right)^2\right]\\=\dfrac{20}{7}.\left(\dfrac{6}{5}+\dfrac{9}{4}\right)\\ =\dfrac{20}{7}.\dfrac{69}{20}\\ =\dfrac{69}{7}\)