Respuesta:
Pregunta 1
[tex] \frac{3}{8} \times \frac{4}{7} = \frac{3}{14} [/tex]
[tex] \frac{12}{13} \div \frac{2}{3} = \frac{18}{13} [/tex]
[tex]9 \times \frac{1}{4} = \frac{9}{4} [/tex]
[tex] \frac{13}{14} \div \frac{9}{2} = \frac{13}{63} [/tex]
Pregunta 2
[tex] \frac{1}{2} \div \frac{3}{5} + \frac{7}{3} \times \frac{5}{4} = \frac{5}{6} + \frac{35}{12} = \frac{45}{12} = \frac{15}{4} [/tex]
[tex] \frac{8}{3} \times ( \frac{5}{4} - \frac{3}{2} ) = \frac{8}{3} ( \frac{ - 2}{8} ) = - \frac{2}{3} [/tex]
[tex] \frac{4}{9} + \frac{12}{5} \div ( - \frac{36}{25} ) = \frac{4}{9} + \frac{12}{5} \times ( - \frac{25}{36} ) = \frac{4}{9} - \frac{5}{3} = - \frac{11}{9} [/tex]
[tex]( \frac{2}{3} - \frac{11}{6} ) \times ( - \frac{9}{14} ) = - \frac{7}{6} \times - \frac{9}{14} = \frac{9}{12} = \frac{3}{4} [/tex]
[tex] - \frac{3}{4} \div ( - \frac{27}{8} ) - \frac{5}{3} = - \frac{3}{4} \times ( - \frac{8}{27} ) - \frac{5}{3} = \frac{2}{9} - \frac{5}{3} = - \frac{13}{9} [/tex]
