4 Сократи дроби: a) \frac{55}{99} = б) \frac{60}{70} = в) \frac{36}{138} = г) \frac{120}{125} = д) \frac{18}{20} = e) \frac{3}{81} =

a) \frac{55}{99} = \frac{5 \cdot 11}{9 \cdot 11} = \frac{5}{9}

б) \frac{60}{70} = \frac{6 \cdot 10}{7 \cdot 10} = \frac{6}{7}

в) \frac{36}{138} = \frac{6 \cdot 6}{6 \cdot 23} = \frac{6}{23}

г) \frac{120}{125} = \frac{24 \cdot 5}{25 \cdot 5} = \frac{24}{25}

д) \frac{18}{20} = \frac{9 \cdot 2}{10 \cdot 2} = \frac{9}{10}

e) \frac{3}{81} = \frac{1 \cdot 3}{27 \cdot 3} = \frac{1}{27}

Ответ: a) \frac{5}{9}; б) \frac{6}{7}; в) \frac{6}{23}; г) \frac{24}{25}; д) \frac{9}{10}; e) \frac{1}{27}