Сравните дроби, приведя их к общему знаменателю: а) 1/15 и 1/20 б) 2/13 и 4/11 в) 7/20 и 10/15 г) 3/8 и 9/20 д) 5/7 и 19/21

[latex] \frac{1}{15}>\frac{1}{20} [/latex]             [latex] \frac{4}{60}\ \textgreater \ \frac{3}{60} [/latex] [latex] \frac{2}{13}<\frac{4}{11}[/latex]           [latex] \frac{22}{143}\ \textless \ \frac{52}{143} [/latex] [latex] \frac{7}{20}<\frac{10}{15}[/latex]             [latex] \frac{24}{60}\ \textless \ \frac{40}{60} [/latex] [latex] \frac{3}{8}< \frac{9}{20} [/latex]           [latex] \frac{15}{40}\ \textless \ \frac{18}{40} [/latex] [latex] \frac{5}{7}\ \textless \ \frac{19}{21}[/latex]       [latex] \frac{15}{21}\ \textless \ \frac{19}{21} [/latex]