a) Ta có: \(\frac{13}{27}=1-\frac{14}{27}\)
\(\frac{27}{41}=1-\frac{14}{41}\)
Vì \(\frac{14}{27}>\frac{14}{41}\)nên \(1-\frac{14}{27}< 1-\frac{14}{41}\)nên \(\frac{13}{27}< \frac{27}{41}\)
b) Ta có : Vì \(\frac{12}{49}< \frac{13}{49}< \frac{13}{37}\)
nên \(\frac{12}{49}< \frac{13}{37}\)