Question

Answer 1

a.Ta có:\(\dfrac{1691}{3259}< \dfrac{1691}{1234}\)

      mà  \(\dfrac{1691}{1234}< \dfrac{1785}{1234}\)

→\(\dfrac{1691}{3259}< \dfrac{1785}{1234}\)

Answer 2

b) Ta có: \(\dfrac{2761}{3594}< 1\)

\(1< \dfrac{4181}{1312}\)

Do đó: \(\dfrac{2761}{3594}< \dfrac{4181}{1312}\)

\(\Leftrightarrow\dfrac{-2761}{3594}>\dfrac{-4181}{1312}\)