[tex]\frac{-4.9* \frac{5}{7}-2,7*(- \frac{2}{3})^2}{ -0,3* \frac{5}{6}+(- \frac{3}{4}) } =\frac{- \frac{\not{49}^7}{\not{10}^2}* \frac{\not{5}^1}{\not{7}^1}-\frac{\not{27}^3}{\not{10}^5}* \frac{\not{4}^2}{\not{9}^1} }{ -\frac{\not{3}^1}{\not{10}^2}* \frac{\not{5}^1}{\not{6}^2} - \frac{3}{4}} =\frac{-\frac{7}{2}-\frac{6}{5}}{-\frac{1}{4}-\frac{3}{4}}= \frac{-\frac{35}{10}-\frac{12}{10}}{-\frac{4}{4} }=\\\\= \frac{-\frac{47}{10}}{-1}=\frac{47}{10}=4,7[/tex]
