Сравните дроби а)11/12 и 13/15 б)17/48 и 25/72

$a) \frac{11}{12}$ и $\frac{13}{15}$
$\frac{11}{12} = \frac{55}{60}$
$\frac{13}{15} = \frac{52}{60}$
$\frac{55}{60} \ \textgreater \ \frac{52}{60}$ → $\frac{11}{12}\ \textgreater \ \frac{13}{15}$

б) $\frac{17}{48}$ и $\frac{25}{72}$
$\frac{17}{48} = \frac{51}{144}$
$\frac{25}{72} = \frac{50}{144}$
$\frac{51}{144} \ \textgreater \ \frac{50}{144}$
$\frac{17}{48} \ \textgreater \ \frac{25}{72}$