Question

Dùng phân số trung gian so sánh:

a) \(\dfrac{-317}{633}\) và \(\dfrac{-371}{743}\)

b) \(\dfrac{-24}{35}\) và \(\dfrac{-19}{30}\)

Answer 1

a, Ta có: \(-\dfrac{317}{633}< -\dfrac{1}{2}\left(1\right)\)

\(\dfrac{-371}{743}>-\dfrac{1}{2}\left(2\right)\)

Từ (1); (2), Suy ra:

\(-\dfrac{317}{633}< \dfrac{-371}{743}\)

b, Ta có: \(\dfrac{-24}{35}< \dfrac{-24}{36}=\dfrac{-2}{3}\left(1\right)\)

\(\dfrac{-19}{30}>\dfrac{-20}{30}=\dfrac{-2}{3}\left(2\right)\)

Từ (1); (2) Suy ra:

\(\dfrac{-24}{35}< \dfrac{-19}{30}\)