[tex] - \frac{5}{2} \times \frac{5}{8} \\ - \frac{5 \times 5}{2 \times 8} = \\ - \frac{25}{16} \\ \frac{ - 2}{3} \times \frac{ - 7}{11} \\ \frac{ - 2}{3} \times ( \frac{ - 7}{11} \\ \frac{2}{3} \times \frac{7}{11} = \frac{14}{33} \\ \frac{12}{13} \times \frac{7}{3} \frac{4}{13} \times 7 = \frac{28}{13} \\ \frac{ - 3}{6} \times \frac{ - 3}{7} \\ \frac{ - 1}{2} \times7 = \frac{ - 7}{2} \\ \frac{1}{7} \times \frac{2}{7} \\ \frac{1 \times 2}{7 \times 7} \\ \frac{2}{49} \\ \frac{ - 9}{3} \times \frac{ - 6}{15} \\ - 3 \times \frac{2}{5} = \frac{ - 6}{5} [/tex]
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[tex] - \frac{5}{2} \times \frac{5}{8} \\ - \frac{5 \times 5}{2 \times 8} = \\ - \frac{25}{16} \\ \frac{ - 2}{3} \times \frac{ - 7}{11} \\ \frac{ - 2}{3} \times ( \frac{ - 7}{11} \\ \frac{2}{3} \times \frac{7}{11} = \frac{14}{33} \\ \frac{12}{13} \times \frac{7}{3} \frac{4}{13} \times 7 = \frac{28}{13} \\ \frac{ - 3}{6} \times \frac{ - 3}{7} \\ \frac{ - 1}{2} \times7 = \frac{ - 7}{2} \\ \frac{1}{7} \times \frac{2}{7} \\ \frac{1 \times 2}{7 \times 7} \\ \frac{2}{49} \\ \frac{ - 9}{3} \times \frac{ - 6}{15} \\ - 3 \times \frac{2}{5} = \frac{ - 6}{5} [/tex]
estan todos espero q te ayude