a: \(-\dfrac{108}{-120}=\dfrac{9}{10}=0.9\)
\(\dfrac{21}{24}=\dfrac{7}{8}=0.875\)
mà 0,9>0,875
nên \(-\dfrac{108}{-120}>\dfrac{21}{24}\)
k: \(\dfrac{101}{99}=1+\dfrac{2}{99}\)
\(\dfrac{81}{79}=1+\dfrac{2}{79}\)
mà 2/99<2/79
nên 101/99<81/79
\(h.-\dfrac{108}{-120}=\dfrac{108}{120}\)
\(\dfrac{21}{24}=\dfrac{21.5}{24.5}=\dfrac{105}{120}\)
Vì \(108>105\)
\(\Rightarrow-\dfrac{108}{-120}>\dfrac{21}{24}\)
\(\)\(k,\dfrac{101}{99}=\dfrac{7979}{7821}\)
\(\dfrac{81}{79}=\dfrac{8019}{7821}\)
Vì \(7979< 8019\)
\(\dfrac{101}{99}< \dfrac{81}{79}\)
h)\(\dfrac{-108}{-120}=\dfrac{108}{120}\)
\(\dfrac{21}{24}=\dfrac{105}{120}\)
=>\(\dfrac{-108}{-120}>\dfrac{21}{24}\left(\dfrac{108}{120}>\dfrac{105}{120}\right)\)
k)\(\dfrac{101}{99}=\dfrac{7979}{7821}\)
\(\dfrac{81}{79}=\dfrac{8019}{7821}\)
=>\(\dfrac{101}{99}< \dfrac{81}{79}\left(\dfrac{7979}{7821}< \dfrac{8019}{7821}\right)\)
