Explicação passo-a-passo:
[tex]5 \div \dfrac{1}{4} = 5 \times \dfrac{4}{1} = \dfrac{20}{1} = 20[/tex]
[tex] \dfrac{5}{8} \div 2 = \dfrac{5}{8} \times \dfrac{1}{2} = \dfrac{5}{16} [/tex]
[tex]1 \div \dfrac{4}{11} = 1 \times \dfrac{11}{4} = \dfrac{11}{4} [/tex]
[tex]0 \div \dfrac{5}{9} = 0 \times \dfrac{9}{5} = \dfrac{0}{5} = 0[/tex]
