Réponse:
[tex]a) \: \: \: \frac{2}{3} \times \frac{9}{4} = \frac{2 \times 9}{3 \times 4} = \frac{2 \times 3 \times 3}{3 \times 2 \times 2} = \frac{3}{2} [/tex]
[tex]b) \: \: \: \frac{15}{7} \times \frac{14}{25} = \frac{15 \times 14}{7 \times 25} = \frac{5 \times 3 \times 7 \times 2}{7 \times 5 \times 5} = \frac{3 \times 2}{5} = \frac{6}{5} [/tex]
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Réponse:
[tex]a) \: \: \: \frac{2}{3} \times \frac{9}{4} = \frac{2 \times 9}{3 \times 4} = \frac{2 \times 3 \times 3}{3 \times 2 \times 2} = \frac{3}{2} [/tex]
[tex]b) \: \: \: \frac{15}{7} \times \frac{14}{25} = \frac{15 \times 14}{7 \times 25} = \frac{5 \times 3 \times 7 \times 2}{7 \times 5 \times 5} = \frac{3 \times 2}{5} = \frac{6}{5} [/tex]