Question

5.3 Pratique o que você aprendeu​

Answer 1

Explicação passo-a-passo:

a) $\sf 15\div3=15\cdot\dfrac{1}{3}=\dfrac{15\div3}{3\div3}=\red{5}$

b) $\sf \dfrac{7}{8}\div\dfrac{7}{4}=\dfrac{7}{8}\cdot\dfrac{4}{7}=\dfrac{28\div14}{56\div14}=\red{\dfrac{1}{2}}$

c) $\sf \dfrac{14}{5}\div2=\dfrac{14}{5}\cdot\dfrac{1}{2}=\dfrac{14\div2}{10\div2}=\red{\dfrac{7}{5}}$

d) $\sf \dfrac{5}{9}\div\dfrac{1}{3}=\dfrac{5}{9}\cdot\dfrac{3}{1}=\dfrac{15\div3}{9\div3}=\red{\dfrac{5}{3}}$