Сравните значения выражений:
а) \(56 \cdot \frac{2}{7}\) и \(56 : \frac{7}{2}\)
\(56 \cdot \frac{2}{7} = \frac{56 \cdot 2}{7} = \frac{8 \cdot 2}{1} = 16\)
\(56 : \frac{7}{2} = 56 \cdot \frac{2}{7} = \frac{56 \cdot 2}{7} = \frac{8 \cdot 2}{1} = 16\)
16 = 16

б) 9 : 0,36 и 0,9
25 > 0,9

в) \(\frac{3}{5} - \frac{5}{4}\) и \(\frac{3}{8} \cdot (-\frac{5}{4})\)
\(\frac{3}{5} - \frac{5}{4} = \frac{12}{20} - \frac{25}{20} = -\frac{13}{20}\)
\(\frac{3}{8} \cdot (-\frac{5}{4}) = -(\frac{3}{8} \cdot \frac{5}{4}) = -\frac{15}{32}\)
\(-\frac{13}{20}\) и \(-\frac{15}{32}\)
\(-\frac{104}{160}\) < \(-\frac{75}{160}\)

г) \(\frac{1}{8} - \frac{1}{9}\) и \(\frac{1}{9} - \frac{1}{10}\)
\(\frac{1}{8} - \frac{1}{9} = \frac{9}{72} - \frac{8}{72} = \frac{1}{72}\)
\(\frac{1}{9} - \frac{1}{10} = \frac{10}{90} - \frac{9}{90} = \frac{1}{90}\)
\(\frac{1}{72}\) > \(\frac{1}{90}\).