Question

So sánh:

a, \(\dfrac{32}{37}và\dfrac{19}{54}\)

b, \(\dfrac{18}{53}và\dfrac{26}{78}\)

c, \(\dfrac{25}{103}và\dfrac{74}{295}\)

Help me!!!

Answer 1

a, Ta có: \(\dfrac{32}{37}>\dfrac{32}{54}>\dfrac{19}{54}\Rightarrow\dfrac{32}{37}>\dfrac{19}{54}\)

b, Ta có: \(\dfrac{18}{53}>\dfrac{18}{54}=\dfrac{1}{3}\Rightarrow\dfrac{18}{53}>\dfrac{1}{3}\left(1\right)\)

\(\dfrac{26}{78}=\dfrac{1}{3}\left(2\right)\)

Từ (1) và (2) ta suy ra \(\dfrac{18}{53}>\dfrac{26}{78}\)

c, Ta thấy: \(\dfrac{25}{103}< \dfrac{25}{100}=\dfrac{1}{4}\left(1\right)\)

\(\dfrac{74}{295}>\dfrac{74}{296}=\dfrac{1}{4}\left(2\right)\)

Từ (1) và (2) ta suy ra \(\dfrac{25}{103}< \dfrac{74}{295}\)

Answer 2

tick cho mk với

Answer 3

a, Ta có: \(\dfrac{32}{37}>\dfrac{32}{54}\)

Vì \(\dfrac{32}{54}>\dfrac{19}{54}\) nên \(\dfrac{32}{37}>\dfrac{19}{54}\).

b, Ta có: \(\dfrac{18}{53}>\dfrac{18}{54}\Rightarrow\dfrac{18}{53}>\dfrac{1}{3}\)

\(\dfrac{26}{78}=\dfrac{1}{3}\)

\(\Rightarrow\dfrac{1}{3}=\dfrac{1}{3}\Rightarrow\dfrac{18}{54}=\dfrac{26}{78}\)

Mà \(\dfrac{18}{53}>\dfrac{18}{54}\)

\(\Rightarrow\dfrac{18}{53}>\dfrac{26}{78}\)

Câu c tương tự câu b nhé!