Cách làm cho bạn:
$\frac{5}{7}$ ..... $\frac{7}{9}$ $\frac{7}{8}$ ...... $\frac{5}{6}$
=> $\frac{45}{63}$ > $\frac{42}{63}$ =>$\frac{21}{24}$ > $\frac{20}{24}$
$\frac{10}{15}$ ...... $\frac{16}{24}$ $\frac{19}{43}$ ..... $\frac{19}{34}$
=> $\frac{240}{360}$ = $\frac{240}{360}$ => $\frac{19}{43}$ < $\frac{19}{34}$
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