\(a,\dfrac{3}{4}=\dfrac{3.7}{4.7}=\dfrac{21}{28}\\ \dfrac{6}{7}=\dfrac{6.4}{7.4}=\dfrac{24}{28}\)
mà 21 < 24
\(\dfrac{3}{4}< \dfrac{6}{7}\)
\(b,\dfrac{-17}{21}=\dfrac{-17.31}{651}=\dfrac{-527}{651}\\ \dfrac{-51}{31}=\dfrac{-51.21}{651}=\dfrac{-1071}{651}\)
mà -527> -1071\(=>\dfrac{17}{-21}>\dfrac{51}{-31}\)
\(c,-\dfrac{4}{9}=\dfrac{-4.13}{117}=\dfrac{-52}{117}\\ -\dfrac{3}{13}=\dfrac{-3.9}{117}=-\dfrac{27}{117}\)
mà - 52 < - 27
=> \(-\dfrac{4}{9}< -\dfrac{3}{13}\)
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