Сравните дроби, приведя их к общему знаменателю: а) 1/15 и 1/20 б) 2/13 и 4/11 в) 7/20 и...

\frac{1}{20} " alt=" \frac{1}{15}>\frac{1}{20} " align="absmiddle" class="latex-formula">    $\frac{4}{60}\ \textgreater \ \frac{3}{60}$

$\frac{2}{13}<\frac{4}{11}$ $\frac{22}{143}\ \textless \ \frac{52}{143}$

$\frac{7}{20}<\frac{10}{15}$    $\frac{24}{60}\ \textless \ \frac{40}{60}$

$\frac{3}{8}< \frac{9}{20}$    $\frac{15}{40}\ \textless \ \frac{18}{40}$

$\frac{5}{7}\ \textless \ \frac{19}{21}$    $\frac{15}{21}\ \textless \ \frac{19}{21}$