Odpowiedź:
[tex]\text{Liczba odwrotna do a to} \ \frac{1}{\text{a}}\\\\\text{a}=-1\frac{3}{4}=-\frac{1\cdot4+3}{4}=-\frac{4+3}{4}=-\frac{7}{4}\\\\\text{Liczba odwrotna do} \ -1\frac{3}{4} \ \text{to} \ \frac{1}{-\frac{7}{4}}=1\cdot(-\frac{4}{7})=-\frac{4}{7}\\\\\boxed{\text{Odp}. \ \text{A}}[/tex]
