4) \(\frac{5}{8} - \frac{3}{8}\) 6) \(\frac{4}{11} + \frac{4}{5}\) 8) \(\frac{2}{3} - \frac{11}{13}\) 10) \(2 \frac{4}{5} + 1 \frac{1}{15}\) 12) \(4 - 2 \frac{3}{14}\) 14) \(10 \frac{3}{8} - 7 \frac{5}{9}\)

Решение:

• 4) \(\frac{5}{8} - \frac{3}{8} = \frac{5-3}{8} = \frac{2}{8} = \frac{1}{4}\)
• 6) \(\frac{4}{11} + \frac{4}{5} = \frac{4 \cdot 5}{11 \cdot 5} + \frac{4 \cdot 11}{5 \cdot 11} = \frac{20}{55} + \frac{44}{55} = \frac{20+44}{55} = \frac{64}{55}\)
• 8) \(\frac{2}{3} - \frac{11}{13} = \frac{2 \cdot 13}{3 \cdot 13} - \frac{11 \cdot 3}{13 \cdot 3} = \frac{26}{39} - \frac{33}{39} = \frac{26-33}{39} = -\frac{7}{39}\)
• 10) \(2 \frac{4}{5} + 1 \frac{1}{15} = \frac{14}{5} + \frac{16}{15} = \frac{14 \cdot 3}{5 \cdot 3} + \frac{16}{15} = \frac{42}{15} + \frac{16}{15} = \frac{42+16}{15} = \frac{58}{15} = 3 \frac{13}{15}\)
• 12) \(4 - 2 \frac{3}{14} = 4 - \frac{31}{14} = \frac{4 \cdot 14}{14} - \frac{31}{14} = \frac{56}{14} - \frac{31}{14} = \frac{56-31}{14} = \frac{25}{14} = 1 \frac{11}{14}\)
• 14) \(10 \frac{3}{8} - 7 \frac{5}{9} = \frac{83}{8} - \frac{68}{9} = \frac{83 \cdot 9}{8 \cdot 9} - \frac{68 \cdot 8}{9 \cdot 8} = \frac{747}{72} - \frac{544}{72} = \frac{747-544}{72} = \frac{203}{72}\)

Ответ: 1/4; 64/55; -7/39; 58/15; 25/14; 203/72.