Zad. 2
a=\frac{4\frac{2}{7}:1\frac{1}{14}-3,4*1,25}{(16\frac{2}{17}-14\frac{1}{34})* \frac{1}{71}}=\frac{\frac{30}{7}*\frac{14}{15}-4,25}{(16\frac{4}{34}-14\frac{1}{34})*\frac{1}{71}}=
=\frac{4-4,25}{2\frac{3}{34}*\frac{1}{71}}=\frac{ -\frac{1}{4} }{\frac{71}{34}*\frac{1}{71}}= -\frac{1}{4} *34=-\frac{34}{4}=-8,5
-a=8,5 | Liczba przeciwna
\frac{1}{a}=-\frac{4}{34} | Liczba odwrotna