\(\dfrac{5}{9}=\dfrac{15}{27}\)

\(\dfrac{20}{36}=\dfrac{30}{54}\)

\(\dfrac{15}{40}=\dfrac{15:5}{40:5}=\dfrac{3}{8}\)

\(\dfrac{9}{12}=\dfrac{9:3}{12:3}=\dfrac{3}{4}\)

\(\dfrac{7}{2}=\dfrac{42}{12}=\dfrac{28}{8}=\dfrac{35}{10}\)

\(\dfrac{18}{30}\)

1 km² =1 000 000 cm²

36 dm²=3600cm²

=\(\dfrac{25}{1}\)

\(\dfrac{5}{4}=\dfrac{15}{12}\)

\(\dfrac{16}{18},\dfrac{24}{27},\dfrac{32}{36},\dfrac{40}{45},\dfrac{48}{54},\dfrac{56}{63}\)