Вычислите -2/9 : 6 -15/11 : (-25) -13/17 : ( 1 ) 1 : - 9/101

Решите задачу:

$- \frac{2}{9}:6=- \frac{2}{9}: \frac{6}{1 \frac{x}{y} }= -\frac{2}{9}* \frac{1}{6}= -\frac{2*1}{9*6}= -\frac{2}{54}=- \frac{1*2}{27*2}=-\frac{1}{27} \\ \\ - \frac{15}{11}:(-25)= -\frac{15}{11}:(- \frac{25}{1})=- \frac{15}{11}*(- \frac{1}{25})= \frac{15*1}{11*25}= \frac{15}{275}= \\ \\ \frac{3*5}{55*5}= \frac{3}{55} \\ \\ - \frac{13}{17}:1=- \frac{13}{17} \\ \\ 1:(- \frac{9}{101})= \frac{1}{1}*(- \frac{101}{9})=- \frac{1*101}{1*9}= - \frac{101}{9}=-11 \frac{2}{9}$