a) \(\dfrac{-1.2}{16}=\dfrac{-0.48}{6.4};\dfrac{-1.2}{-0.48}=\dfrac{16}{6.4};\dfrac{16}{-1.2}=\dfrac{6.4}{-0.48};\dfrac{-0.48}{-1.2}=\dfrac{6.4}{16}\)
b) \(\dfrac{7}{0.8}=\dfrac{21}{2.4};\dfrac{0.8}{7}=\dfrac{2.4}{21};\dfrac{21}{7}=\dfrac{2.4}{0.8}\)