$a$) $\frac{14}{15}$ $và$ $\frac{133}{153}$
$=>$ $quy$ $đồng$
$=$ $14$ × $153$, $15$ × $153$ $=$ $\frac{2142}{2295}$
$=$ $133$ × $15$, $153$ × $15$ $=$ $\frac{1995}{2296}$
$=>$ $\frac{2142}{2295}$ $>$ $\frac{1995}{2296}$
$b$) $\frac{13}{15}$ $và$ $\frac{1333}{1555}$
$=>$ $quy$ $đồng$
$=$ $13$ × $1555$, $15$ × $1555$ $=$ $\frac{20215}{23325}$
$=$ $1333$ × $15$, $1555$ × $15$ $=$ $\frac{19995}{23325}$
$=>$ $\frac{20215}{23325}$ $>$ $\frac{19995}{23325}$
