Cevap:
[tex]14. \: \: \frac{ - 1}{5} \\ 15. \: \: \frac{1}{60} \\ 16. \: \: 3[/tex]
Açıklama:
[tex]14. \: \: =\frac{2}{5} - \frac{3}{4} + \frac{3}{2} - \frac{3}{2} + \frac{7}{5} - \frac{5}{4} \\ = \frac{9}{5} - \frac{8}{4} = \frac{36}{20} - \frac{40}{20} = \frac{ - 4}{20} = \frac{ - 1}{5} [/tex]
[tex]15. \: \: \frac{2}{3} + \frac{3}{4} + \frac{6}{7} - \frac{6}{7} - \frac{4}{5} - \frac{3}{5} \\ = \frac{2}{3} + \frac{3}{4} - \frac{7}{5} \\ = \frac{40}{60} + \frac{45}{60} - \frac{84}{60} = \frac{1}{60} [/tex]
[tex]16. \: \: a + b= \frac{1}{2} - \frac{4}{3} + \frac{3}{5} + \frac{3}{4} + \frac{3}{2} + \frac{1}{3} + \frac{7}{5} - \frac{3}{4} = \frac{4}{2} - \frac{ 3}{3} + \frac{10}{5} =2 - 1 + 2 = 3[/tex]
