Ta có :
\(1,4.\dfrac{15}{49}-\left(20\%+\dfrac{2}{3}\right):\dfrac{11}{5}\)
\(=\dfrac{14}{10}.\dfrac{15}{49}-\left(\dfrac{20}{100}+\dfrac{2}{3}\right).\dfrac{5}{11}\)
\(=\dfrac{7}{5}.\dfrac{15}{49}-\left(\dfrac{1}{5}+\dfrac{2}{3}\right).\dfrac{5}{11}\)
\(=\dfrac{3}{7}-\dfrac{13}{15}.\dfrac{5}{11}\)
\(=\dfrac{3}{7}-\dfrac{13}{33}=\dfrac{8}{231}\)
~ Học tốt ~
\(1.4\times\dfrac{15}{49}-\left(20\%+\dfrac{2}{3}\right):\dfrac{11}{5}\)
\(=\dfrac{7}{5}\times\dfrac{15}{49}-\left(\dfrac{1}{5}+\dfrac{2}{3}\right):\dfrac{11}{5}\)
\(=\dfrac{3}{7}-\dfrac{13}{15}:\dfrac{11}{15}\)
\(=\dfrac{3}{7}-\dfrac{11}{5}=\dfrac{13}{33}\)
