Решите плиз 2 и очень надо

[latex]1)- \frac{1}{12} * \frac{3}{5} = -\frac{1}{20} \\ 2) \frac{2}{3} :(- \frac{10}{9})=- \frac{2}{3} * \frac{9}{10} = -\frac{3}{5} = -\frac{12}{20} \\ 3) - \frac{1}{20} - (- \frac{12}{20} ) = \frac{12}{20} - \frac{1}{20} = \frac{11}{20} [/latex]