a) \(\dfrac{13}{38}\) và \(\dfrac{1}{3}\)
\(\dfrac{1}{3}\) = \(\dfrac{13}{39}\) < \(\dfrac{13}{38}\)
=> \(\dfrac{13}{38}>\dfrac{1}{3}\)
b)\(\sqrt{235}\) và 15
15 = \(\sqrt{225}\) < \(\sqrt{235}\) ( vì 225 < 235)
=> \(\sqrt{235}>15\)
tick mình nha
=>
a, Ta có:
\(\dfrac{13}{38}\)=\(\dfrac{39}{114}\) ; \(\dfrac{1}{3}\)=\(\dfrac{38}{114}\)
Vì 38 < 39 ⇒ \(\dfrac{39}{114}>\dfrac{38}{114}\)
Vay \(\dfrac{13}{38}>\dfrac{1}{3}\)
b, Goi \(\sqrt{235}\)= a ⇒ 235 = \(a^2\)
Ta có : 15^2= 225
Vì 235 > 225 nên a^2 > 15^2
Vay \(\sqrt{235}\)>15