Question

Answer 1

a) \(\dfrac{-2}{5}+\dfrac{7}{21}=-\dfrac{1}{15}\)

b) \(\dfrac{3}{8}+\dfrac{-5}{6}=-\dfrac{11}{24}\)

c) \(\dfrac{15}{12}-\dfrac{-1}{4}=\dfrac{3}{2}\)

d) \(\dfrac{-1}{12}\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)=\dfrac{-1}{12}\left(\dfrac{21}{8}-\dfrac{1}{3}\right)=\dfrac{-1}{12}\cdot\dfrac{55}{24}=-\dfrac{55}{288}\)

e) \(-1,75-\left(\dfrac{-1}{9}-2\dfrac{1}{18}\right)=-\dfrac{7}{4}-\left(\dfrac{-1}{9}-\dfrac{37}{18}\right)=-\dfrac{7}{4}-\dfrac{13}{6}=-\dfrac{47}{12}\)