a) Cách 1 :
Ta có :
\(\frac{4}{3}>1\)
\(\frac{3}{4} <1\)
\(=> \frac{3}{4} < \frac{4}{3}\)
Cách 2 :
\(\frac{3}{4} = \frac{9}{12} < \frac{4}{3} = \frac{12}{9}\)
b ) Cách 1 :
\(\frac{5}{7} < 1\)
\(\frac{7}{5} >1\)
\(=> \frac{7}{5} >\frac{5}{7}\)
Cách 2 ;
\(\frac{49}{35} = \frac{7}{5} > \frac{5}{7} = \frac{35}{49}\)