\(a,\dfrac{1}{2023}>0;-\dfrac{5}{2024}< 0\\ Nên:-\dfrac{5}{2024}< 0< \dfrac{1}{2023}\Rightarrow-\dfrac{5}{2024}< \dfrac{1}{2023}\\ b,\dfrac{678}{876}< 1;\dfrac{987}{789}>1\\ Nên:\dfrac{678}{876}< 1< \dfrac{987}{789}\Rightarrow\dfrac{678}{876}< \dfrac{987}{789}\)
\(c,\dfrac{535353}{585858}=\dfrac{535353:10101}{585858:10101}=\dfrac{53}{58}=1-\dfrac{5}{58}\\ \dfrac{301}{306}=1-\dfrac{5}{306}\\ Vì:\dfrac{5}{58}>\dfrac{5}{306}\Rightarrow1-\dfrac{5}{58}< 1-\dfrac{5}{306}\\ Nên:\dfrac{535353}{585858}< \dfrac{301}{306}\)
\(d,\dfrac{9}{71}=\dfrac{9.3}{71.3}=\dfrac{27}{213}\\ Vì:\dfrac{27}{213}< \dfrac{27}{211}\\ Nên:\dfrac{9}{71}< \dfrac{27}{211}\)
