Задание 1. Найдите значение выражения

\[\frac{3 \cdot 6}{4 \cdot 5} = \frac{18}{20} = \frac{9}{10}\]
\[\frac{21 \cdot 3}{5 \cdot 7} = \frac{63}{35} = \frac{9}{5}\]
\[\frac{3 \cdot 25}{5 \cdot 4} = \frac{75}{20} = \frac{15}{4}\]
\[\frac{9 \cdot 2}{5 \cdot 3} = \frac{18}{15} = \frac{6}{5}\]
\[\frac{5 \cdot 9}{3 \cdot 2} = \frac{45}{6} = \frac{15}{2}\]
\[\frac{7 \cdot 12}{5 \cdot 35} = \frac{84}{175} = \frac{12}{25}\]
\[\frac{12 \cdot 15}{5 \cdot 2} = \frac{180}{10} = 18\]
\[\frac{6 \cdot 4}{5 \cdot 11} = \frac{24}{55}\]
\[\frac{3 \cdot 4}{5 \cdot 35} = \frac{12}{175}\]
\[\frac{15 \cdot 3}{4 \cdot 7} = \frac{45}{28}\]
\[\frac{21 \cdot 3}{2 \cdot 5} = \frac{63}{10}\]
\[\frac{14 \cdot 7}{5 \cdot 2} = \frac{98}{10} = \frac{49}{5}\]
\[\frac{1}{4} - \frac{3}{25} = \frac{25}{100} - \frac{12}{100} = \frac{13}{100}\]
\[\frac{1}{5} - \frac{27}{50} = \frac{10}{50} - \frac{27}{50} = -\frac{17}{50}\]
\[\frac{1}{2} - \frac{9}{25} = \frac{25}{50} - \frac{18}{50} = \frac{7}{50}\]
\[\frac{1}{5} - \frac{3}{4} = \frac{4}{20} - \frac{15}{20} = -\frac{11}{20}\]
\[\frac{1}{2} - \frac{13}{50} = \frac{25}{50} - \frac{13}{50} = \frac{12}{50} = \frac{6}{25}\]
\[\frac{1}{10} - \frac{23}{20} = \frac{2}{20} - \frac{23}{20} = -\frac{21}{20}\]
\[\frac{14}{25} + \frac{3}{2} = \frac{28}{50} + \frac{75}{50} = \frac{103}{50}\]
\[\frac{9}{4} + \frac{8}{5} = \frac{45}{20} + \frac{32}{20} = \frac{77}{20}\]
\[\frac{11}{5} + \frac{13}{4} = \frac{44}{20} + \frac{65}{20} = \frac{109}{20}\]
\[\frac{1}{10} + \frac{21}{50} = \frac{5}{50} + \frac{21}{50} = \frac{26}{50} = \frac{13}{25}\]
\[\frac{3}{4} + \frac{7}{25} = \frac{75}{100} + \frac{28}{100} = \frac{103}{100}\]
\[\frac{4}{25} + \frac{15}{4} = \frac{16}{100} + \frac{375}{100} = \frac{391}{100}\]

Ответ:

\[\frac{9}{10}\]
\[\frac{9}{5}\]
\[\frac{15}{4}\]
\[\frac{6}{5}\]
\[\frac{15}{2}\]
\[\frac{12}{25}\]
\[18\]
\[\frac{24}{55}\]
\[\frac{12}{175}\]
\[\frac{45}{28}\]
\[\frac{63}{10}\]
\[\frac{49}{5}\]
\[\frac{13}{100}\]
\[-\frac{17}{50}\]
\[\frac{7}{50}\]
\[-\frac{11}{20}\]
\[\frac{6}{25}\]
\[-\frac{21}{20}\]
\[\frac{103}{50}\]
\[\frac{77}{20}\]
\[\frac{109}{20}\]
\[\frac{13}{25}\]
\[\frac{103}{100}\]
\[\frac{391}{100}\]

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