Question

[Trần Xuân Hùng]

Bài 4: So sánh các số sau:

        a) \(\dfrac{15}{21}\) và \(\dfrac{21}{49}\);      b) \(\dfrac{-19}{49}\) và \(\dfrac{-23}{47}\)

Answer 1

[Mira Sensai]

a) \(\dfrac{15}{21}=\dfrac{5}{7}\)

\(\dfrac{21}{49}=\dfrac{3}{7}\)

Ta có \(\dfrac{5}{7}>\dfrac{3}{7}\Rightarrow\dfrac{15}{21}>\dfrac{21}{49}\)