Bonjour,
[tex]A = \frac{2}{3} + \frac{5}{6} = \frac{2 \times 2}{3 \times 2} + \frac{5}{6} = \frac{4 + 5}{6} = \frac{9}{6} = \frac{3 \times 3}{3 \times 2} = \frac{3}{2} [/tex]
[tex]B = \frac{2}{5} \times \frac{7}{10} = \frac{2 \times 7}{5 \times 10} = \frac{14}{50} = \frac{2 \times 7}{2 \times 25} = \frac{7}{25} [/tex]
[tex]C = \frac{3}{4} \times \frac{1}{7} = \frac{3 \times 1}{4 \times 7} = \frac{3}{28} [/tex]
[tex]D = 3 \times \frac{1}{28} = \frac{3}{1} \times \frac{1}{28} = \frac{3 \times 1}{28 \times 1} = \frac{3}{28} [/tex]
