\[\boxed{\mathbf{895\ (895)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ | - 3| = |3| = 3\]
\[\textbf{б)}\ | - 100| = 100;\ \ |20| = 20\]
\[Значит:\ \ | - 100| > |20|.\]
\[\textbf{в)}\ |2,1| = | - 2,1| = 2,1\]
\[\textbf{г)}\ |1,3| = 1,3;\ \ \ | - 0,5| = 0,5\]
\[Значит:\ \ |1,3| > | - 0,5|.\]
\[\textbf{д)}\ \left| - \frac{1}{4} \right| = \frac{1}{4} = 0,25;\ \ \ \left| - \frac{1}{10} \right| = \frac{1}{10} = 0,1\]
\[Значит:\ \ \left| - \frac{1}{4} \right| > \left| - \frac{1}{10} \right|.\]
\[\textbf{е)}\ \left| \frac{3}{4} \right| = \frac{3}{4} = 0,75;\ \ \ \left| - \frac{1}{5} \right| = \frac{1}{5} = 0,2\]
\[Значит:\ \ \left| \frac{3}{4} \right| > \left| - \frac{1}{5} \right|.\]