Ответ:

\(\frac{1{,}8-5{,}4}{0{,}8}=\frac{-3{,}6}{0{,}8}=-4{,}5\).

\(\frac{2{,}3-4{,}3}{0{,}5}=\frac{-2}{0{,}5}=-4\).

Ответ: \(\frac{1{,}8-5{,}4}{0{,}8}<\frac{2{,}3-4{,}3}{0{,}5}\).