\(\left(\dfrac{7}{2}.\dfrac{-4}{5}+\dfrac{7}{2}.\dfrac{-1}{5}\right).20\%-0,1\\ =\dfrac{7}{2}\left(-\dfrac{4}{5}-\dfrac{1}{5}\right).\dfrac{1}{5}-\dfrac{1}{10}\\ =\dfrac{7}{10}.\left(-1\right)-\dfrac{1}{10}\\ =-\dfrac{8}{10}=-\dfrac{4}{5}\)
\(\left(\dfrac{7}{2}\times\dfrac{-4}{5}+\dfrac{7}{2}\times\dfrac{-1}{5}\right)\times20\%-0,1\)
\(=\dfrac{7}{2}\left(\dfrac{-4}{5}+\dfrac{-1}{5}\right)\times20\%-0,1\)
\(=\dfrac{7}{2}\times-1\times20\%-0,1\)
\(=\dfrac{-7}{2}\times20\%-0,1\)
\(=-0,7-0,1\)
\(=-0,8\)
\((\dfrac{7}{2}.\dfrac{-4}{5}+\dfrac{7}{2}.\dfrac{-1}{5}).\dfrac{20}{100}-0,1\)
=\(-\dfrac{104}{25}\)
=-4,16
Sao mỗi người môt kết quả vầy tr.
\(\left(\dfrac{7}{2}.\dfrac{-4}{5}+\dfrac{7}{2}.\dfrac{-1}{5}\right).20\%-0,1\)
\(=\left[\dfrac{7}{2}.\left(\dfrac{-4}{5}+\dfrac{-1}{5}\right)\right].\dfrac{1}{5}-\dfrac{1}{10}\)
\(=\dfrac{7}{2}.\left(-1\right).\dfrac{1}{5}-\dfrac{1}{10}\)
\(=\dfrac{-7}{2}.\dfrac{1}{5}-\dfrac{1}{10}\)
\(=\dfrac{-7}{10}-\dfrac{1}{10}\)
\(=-\dfrac{8}{10}\)
