Question

tính: L =\(\dfrac{\left(\dfrac{13}{84}.1,4-2,5.\dfrac{7}{180}\right):2\dfrac{7}{18}+4\dfrac{1}{2}.0,1}{70,5-528:7\dfrac{1}{2}}\)

Answer 1

\(=\dfrac{\left(\dfrac{13}{84}\cdot\dfrac{7}{5}-\dfrac{5}{2}\cdot\dfrac{7}{180}\right):\dfrac{43}{18}+\dfrac{9}{2}\cdot\dfrac{1}{10}}{70.5-528:7.5}\)

\(=\dfrac{\left(\dfrac{13}{60}-\dfrac{7}{72}\right)\cdot\dfrac{18}{43}+\dfrac{9}{20}}{0.1}\)

\(=10\cdot\left[\dfrac{43}{360}\cdot\dfrac{18}{43}+\dfrac{9}{20}\right]\)

\(=10\cdot\left[\dfrac{1}{20}+\dfrac{9}{20}\right]=10\cdot\dfrac{10}{20}=5\)