Question

ĐANG CẦN GẤP Ạ!!!

Answer 1

8: \(=\dfrac{7}{10}\cdot\dfrac{8}{3}\cdot\dfrac{3}{8}\cdot20\cdot\dfrac{5}{28}=\dfrac{7}{10}\cdot\dfrac{100}{28}=\dfrac{1}{4}\cdot10=\dfrac{10}{4}=\dfrac{5}{2}\)

9 \(=\left(-\dfrac{17}{14}-\dfrac{11}{14}\right)+\left(\dfrac{13}{9}+\dfrac{5}{9}\right)-\dfrac{2}{15}=-2+2-\dfrac{2}{15}=-\dfrac{2}{15}\)

Answer 2

\(0,7.2\dfrac{2}{3}.20.0,375.\dfrac{5}{28}=0,7.\dfrac{8}{3}.20.\dfrac{3}{8}.\dfrac{5}{28}=\dfrac{5}{2}.\\ \dfrac{-17}{14}+\dfrac{13}{9}-\dfrac{2}{15}-\dfrac{11}{14}+\dfrac{5}{9}=2-2-\dfrac{2}{15}=\dfrac{-2}{15}.\)