Question

So sánh các phân số sau:

a) \(\dfrac{23}{27}\)  và \(\dfrac{22}{29}\)  

b) \(\dfrac{15}{25}\)  và \(\dfrac{25}{49}\)

Answer 1

a) Ta có \(\dfrac{23}{27}>\dfrac{23}{29};\dfrac{23}{29}>\dfrac{22}{29}\)

Vậy \(\dfrac{23}{27}>\dfrac{22}{29}\)

b) Ta có \(\dfrac{15}{25}=1-\dfrac{2}{5}\)

\(\dfrac{25}{49}=1-\dfrac{24}{49}\)

Vì \(\dfrac{2}{5}=\dfrac{24}{60}< \dfrac{24}{49}\)

Vậy \(\dfrac{15}{25}>\dfrac{25}{49}\)

Answer 2

23/27 lớn hơn 22/29

15/25 lớn hơn 25/49