Question

Answer 1

a) \(\dfrac{11}{9}:\dfrac{7}{5}\cdot\dfrac{21}{22}=\dfrac{11}{9}\cdot\dfrac{5}{7}\cdot\dfrac{21}{22}=\dfrac{11}{22}\cdot\dfrac{21}{7}\cdot\dfrac{5}{9}=\dfrac{1}{2}\cdot3\cdot\dfrac{5}{9}=\dfrac{3}{2}\cdot\dfrac{5}{9}=\dfrac{5}{6}\)

b) \(\dfrac{5}{18}:1\dfrac{1}{6}-\dfrac{9}{14}:2\dfrac{7}{10}=\dfrac{5}{18}:\dfrac{7}{6}-\dfrac{9}{14}:\dfrac{27}{10}=\dfrac{5}{21}-\dfrac{5}{21}=0\)