Сравни дроби: a) 2/3 и 8/21

Конечно, давай сравним дроби! a) $\frac{2}{3}$ и $\frac{8}{21}$ $\frac{2}{3} = \frac{2 * 7}{3 * 7} = \frac{14}{21}$ $\frac{14}{21} > \frac{8}{21}$ б) $\frac{4}{15}$ и $\frac{2}{5}$ $\frac{2}{5} = \frac{2 * 3}{5 * 3} = \frac{6}{15}$ $\frac{4}{15} < \frac{6}{15}$ в) $\frac{3}{8}$ и $\frac{17}{40}$ $\frac{3}{8} = \frac{3 * 5}{8 * 5} = \frac{15}{40}$ $\frac{15}{40} < \frac{17}{40}$ г) $\frac{5}{6}$ и $\frac{31}{36}$ $\frac{5}{6} = \frac{5 * 6}{6 * 6} = \frac{30}{36}$ $\frac{30}{36} < \frac{31}{36}$ д) $\frac{1}{6}$ и $\frac{4}{21}$ $\frac{1}{6} = \frac{1 * 7}{6 * 7} = \frac{7}{42}$ $\frac{4}{21} = \frac{4 * 2}{21 * 2} = \frac{8}{42}$ $\frac{7}{42} < \frac{8}{42}$ е) $\frac{13}{18}$ и $\frac{11}{15}$ $\frac{13}{18} = \frac{13 * 5}{18 * 5} = \frac{65}{90}$ $\frac{11}{15} = \frac{11 * 6}{15 * 6} = \frac{66}{90}$ $\frac{65}{90} < \frac{66}{90}$ ж) $\frac{17}{125}$ и $\frac{23}{165}$ $\frac{17}{125} = \frac{17 * 33}{125 * 33} = \frac{561}{4125}$ $\frac{23}{165} = \frac{23 * 25}{165 * 25} = \frac{575}{4125}$ $\frac{561}{4125} < \frac{575}{4125}$ з) $\frac{19}{77}$ и $\frac{43}{176}$ $\frac{19}{77} = \frac{19 * 16}{77 * 16} = \frac{304}{1232}$ $\frac{43}{176} = \frac{43 * 7}{176 * 7} = \frac{301}{1232}$ $\frac{304}{1232} > \frac{301}{1232}$