I
- \frac{2}{9*6} = - \frac{1}{9*3} =- \frac{1}{27} ;+ \frac{15}{11*25} = \frac{3}{11*5} = \frac{3}{55} ;
+ \frac{11}{17*1} = \frac{11}{17} ; 1:\frac{9}{101}= - \frac{101}{9} =- 11\frac{2}{9} ;
II
- \frac{6*15}{5*2} =- \frac{3*3}{1} =-9;- \frac{7*21}{9*18} =- \frac{7*7}{3*18} = -\frac{49}{54} ;- \frac{19*9}{3*1}= - \frac{19*3}{1*1}=- \frac{57}{1}=-57 ;