Răspuns:
[tex]c) - \frac{7}{8} - ( 1\frac{3}{4} - \frac{1}{2} ) \\ = - \frac{7}{8} - ( \frac{7}{4} - \frac{1}{2} ) \\ = - \frac{7}{8} - ( \frac{7}{4} - \frac{2}{4} ) \\ = - \frac{7}{8} - \frac{5}{4} \\ = - \frac{7}{8} - \frac{10}{8} \\ = - \frac{17}{8} [/tex]
