Question

Помогите пожалуйста дам 15 балов ​

Answer 1

$\displaystyle \tt \frac{3,45\cdot \frac{20}{23}}{\frac{7}{16}\cdot((3+1)+(\frac{5}{21}+\frac{1}{3}))}+0,5(\frac{61}{10}+\frac{\frac{21}{10}}{\frac{14}{15}+\frac{7}{5}})=\frac{\frac{69}{20}\cdot \frac{20}{23}}{\frac{7}{16}\cdot (4+\frac{4}{7})}+0,5(\frac{61}{10}+\frac{\frac{21}{10}}{\frac{7}{3}})=\frac{3}{\frac{7}{16}\cdot 4\frac{4}{7}}+0,5(\frac{61}{10}+\frac{9}{10})=\frac{3}{\frac{7}{16}\cdot \frac{32}{7}}+0,5\cdot 7=\frac{3}{2}+3,5=\frac{3}{2}+\frac{7}{2}=5$