Question

Efectuați, respectând ordinea operațiilor:
$\frac{1}{2} \div \frac{2}{3} + \frac{3}{4} \div ( - \frac{5}{6})$

Answer 1

1/2 · 3/2 + 3/4 · (-6/5) =
3/4 - 9/10 =
(3·5-9·2)/20 =
(15-18)/20 =
-3/20