Ответ:

[tex]1) - \frac{15}{26} [/tex]

[tex]2)12 \frac{1}{4} [/tex]

[tex]3)10 \frac{1}{2} [/tex]

[tex]4) - 10[/tex]

Пошаговое объяснение:

[tex] - \frac{12}{13} \times 1 \frac{5}{8} = - \frac{12}{13} \times \frac{5}{8} = - \frac{3}{13} \times \frac{5}{2} = - \frac{15}{26} [/tex]

[tex] - 5 \frac{1}{4} \times ( - 2 \frac{1}{3} ) = - \frac{21}{4} \times ( - \frac{7}{3} ) = \frac{21}{4} \times \frac{7}{3} = \frac{7}{4} \times 7 = \frac{49}{4} = 12 \frac{1}{4} [/tex]

[tex] - 1 \frac{5}{7} \times ( - 6 \frac{1}{8} ) = - \frac{12}{7} \times ( - \frac{49}{8} ) = \frac{12}{7} \times \frac{49}{8} = 12 \times \frac{7}{8} = 3 \times \frac{7}{2} = \frac{21}{2} = 10 \frac{1}{2} [/tex]

[tex]3 \frac{3}{5} \times ( - 2 \frac{7}{9} ) = \frac{18}{5} \times ( - \frac{25}{9} ) = - \frac{18}{5} \times \frac{25}{9} = - \frac{2}{5} \times 25 = - 2 \times 5 = - 10[/tex]