a) ta có :
\(\dfrac{1}{-3}=\dfrac{-1}{3}\)
\(\dfrac{2}{-3}=\dfrac{-2}{3}\)
Vì \(\dfrac{-1}{3}>\dfrac{-2}{3}\Leftrightarrow\dfrac{1}{-3}>\dfrac{2}{-3}\)
b) \(\dfrac{2}{-5}< 0\)
Vì \(\dfrac{2}{-5}< 0< \dfrac{3}{5}\Leftrightarrow\dfrac{2}{-5}< \dfrac{3}{5}\)
c) \(\dfrac{5}{3}< \dfrac{5}{2}\)
d) \(\dfrac{-3}{4}>\dfrac{-3}{7}\)