4. Сократим дроби:
а) $$ \frac{112}{154} = \frac{2 \cdot 56}{2 \cdot 77} = \frac{56}{77} = \frac{7 \cdot 8}{7 \cdot 11} = \frac{8}{11} $$
б) $$ \frac{85}{187} = \frac{5 \cdot 17}{11 \cdot 17} = \frac{5}{11} $$
в) $$ \frac{144}{216} = \frac{2 \cdot 72}{2 \cdot 108} = \frac{72}{108} = \frac{36 \cdot 2}{36 \cdot 3} = \frac{2}{3} $$
г) $$ \frac{65}{104} = \frac{5 \cdot 13}{8 \cdot 13} = \frac{5}{8} $$
д) $$ \frac{180}{216} = \frac{2 \cdot 90}{2 \cdot 108} = \frac{90}{108} = \frac{2 \cdot 45}{2 \cdot 54} = \frac{45}{54} = \frac{5 \cdot 9}{6 \cdot 9} = \frac{5}{6} $$
е) $$ \frac{124}{155} = \frac{4 \cdot 31}{5 \cdot 31} = \frac{4}{5} $$
Ответ: а) 8/11; б) 5/11; в) 2/3; г) 5/8; д) 5/6; е) 4/5