Chapitre 12 : Produit et quotient de fraction

${\displaystyle \frac{2}{3}}\times {\displaystyle \frac{4}{5}}={\displaystyle \frac{2\times 4}{3\times 5}}={\displaystyle \frac{8}{15}}$

${\displaystyle \frac{3}{6}}\times {\displaystyle \frac{2}{3}}={\displaystyle \frac{1}{2}}\times {\displaystyle \frac{2}{3}}={\displaystyle \frac{1\times 2}{2\times 3}}={\displaystyle \frac{1}{3}}$

L'inverse de ${\displaystyle \frac{2}{3}}$ est ${\displaystyle \frac{3}{2}}$

\( \dfrac{3}{2} \div \dfrac{4}{5} = \dfrac{3}{2} \times \dfrac{5}{4} = \dfrac{3 \times 5}{2 \times 4} = \dfrac{15}{8}\)