Question

Answer 1

a)\(=-\dfrac{1}{4}+\left(\dfrac{2}{5}+\dfrac{3}{10}\right)=-\dfrac{1}{4}+\dfrac{7}{10}=-\dfrac{5}{20}+\dfrac{14}{20}=\dfrac{9}{20}\)

b)\(=-\dfrac{2}{5}:\left(\dfrac{10}{10}-\dfrac{1}{10}\right)=-\dfrac{2}{5}\times\dfrac{10}{9}=-\dfrac{4}{9}\)

c)\(=\dfrac{7}{18}+\dfrac{1}{5}=\dfrac{35}{90}+\dfrac{18}{90}=\dfrac{53}{90}\)

d)\(=\dfrac{2}{7}\cdot\left(\dfrac{3}{11}+\dfrac{8}{11}\right)=\dfrac{2}{7}\cdot1=\dfrac{2}{7}\)