Răspuns:
[tex] \frac{1 -4 }{7} = - \frac{3}{7} [/tex]
[tex] \frac{1 - 7}{8} = - \frac{6}{8} [/tex]
[tex] \frac{1 - 2}{9} = - \frac{1}{9} [/tex]
[tex] \frac{1 - 3}{4} = - \frac{2}{4} = - \frac{1}{2} [/tex]
[tex] \frac{3 - 1}{2} = \frac{2}{2} = 1[/tex]
[tex] \frac{2 - 3}{4} = - \frac{1}{4} [/tex]
[tex] \frac{1 - 4}{15} = - \frac{3}{15} = - \frac{1}{5} [/tex]
[tex] \frac{1 - 3}{7} = - \frac{2}{7} [/tex]