Fractions (3) : calculs

\frac{a}{b}\, =\, \frac{a\, \times \, k}{b\, \times \, k}

\frac{a}{b}\, =\, \frac{a\, \div \, k}{b\, \div \, k}

\frac{2}{5}\, +\, \frac{7}{5}\, =\, \frac{2\, +\, 7}{5}\, =\, \frac{9}{5}

\frac{2}{3}\, +\, \frac{5}{6}\, =\, \frac{2\, \times \, 2}{3\, \times \, 2}\, +\, \frac{5}{6}\, =\, \frac{4}{6}\, +\, \frac{5}{6}\, =\, \frac{9}{6}

\frac{2}{5}

25\, \times \, \frac{2}{5}\, =\, \frac{50}{5}\, \equiv \, 10

\frac{\textbf{2}}{\textbf{5}}

\frac{3}{4}

\frac{4}{10}

\frac{12}{60}

\frac{6}{15}

\frac{9}{12}

\frac{20}{50}

\frac{18}{45}

\frac{60}{120}

\frac{7}{11}\, +\, \frac{2}{11}

\frac{9}{13}\, -\, \frac{5}{13}

\frac{-7}{3}\, +\, \frac{5}{9}

\frac{2}{9}\, +\, \frac{5}{27}

\frac{7}{11}\, +\, \frac{2}{11}\, =\, \frac{9}{11}

\frac{9}{13}\, -\, \frac{5}{13}\, =\, \frac{4}{13}

\frac{-7}{3}\, +\, \frac{5}{9}\, =\, \frac{-21}{9}\, +\, \frac{5}{9}\, =\, \frac{-16}{9}

\frac{2}{9}\, +\, \frac{5}{27}\, =\, \frac{6}{27}\, +\, \frac{5}{27}\, =\, \frac{11}{27}

75\, \times \, \frac{2}{5}

18\, \times \, \frac{1}{9}

\frac{2}{25}\, \times \, 125

48\, \times \, \frac{1}{20}