a) $\frac{7}{41}$ và $\frac{13}{47}$
Ta có:
$\frac{7}{41}$=$\frac{7.47}{41.47}$ = $\frac{329}{1927}$
$\frac{13}{47}$ = $\frac{13.41}{47.41}$ = $\frac{533}{1927}$
Vì: 329<533
=> $\frac{329}{1927}$<$\frac{533}{1927}$
=> $\frac{7}{41}$<$\frac{13}{47}$
b) $\frac{19}{30}$ và $\frac{40}{59}$
Ta có:
$\frac{19}{30}$=$\frac{19.59}{30.59}$= $\frac{1121}{1770}$
$\frac{40}{59}$=$\frac{40.30}{59.30}$ = $\frac{1200}{1770}$
Vì: 1121<1200
=> $\frac{1121}{1770}$ < $\frac{1200}{1770}$
=> $\frac{19}{30}$<$\frac{40}{59}$
c) $\frac{16}{63}$ và $\frac{5}{22}$
Ta có:
$\frac{16}{63}$ = $\frac{16.22}{63.22}$ = $\frac{352}{1386}$
$\frac{5}{22}$ = $\frac{5.63}{22.63}$ = $\frac{315}{1386}$
Vì:
352>315
=> $\frac{352}{1386}$ > $\frac{315}{1386}$
=> $\frac{16}{63}$>$\frac{5}{22}$
BẠN THAM KHẢO NHA!!!
