a) Ta có: \(\frac{13}{21}=\frac{26}{42}\)
\(\frac{9}{14}=\frac{27}{42}\)
Vì \(\frac{26}{42}< \frac{27}{42}\) nên \(\frac{13}{21}< \frac{9}{14}\)
b) Ta có: \(\frac{7}{-12}=\frac{-21}{36}\)
\(\frac{11}{-18}=\frac{-22}{36}\)
Vì \(\frac{-21}{36}>\frac{-22}{36}\) nên \(\frac{7}{-12}>\frac{11}{-18}\)
c) Ta có: \(\frac{17}{58}=\frac{510}{1740}\)
\(\frac{13}{60}=\frac{377}{1740}\)
Vì \(\frac{510}{1740}>\frac{377}{1740}\) nên \(\frac{17}{58}>\frac{13}{60}\)
d) Ta có: \(\frac{-19}{33}=\frac{-703}{1221}\)
\(\frac{-17}{37}=\frac{-561}{1221}\)
Vì \(\frac{-703}{1221}< \frac{-561}{1221}\) nên \(\frac{-19}{33}< \frac{-17}{33}\)
e) Ta có: \(\frac{67}{77}=\frac{5561}{6391}\)
\(\frac{73}{83}=\frac{5621}{6391}\)
Vì \(\frac{5561}{6391}< \frac{5621}{6391}\) nên \(\frac{67}{77}< \frac{73}{83}\)
f) Ta có: \(\frac{-456}{461}=\frac{-58368}{59008}\)
\(\frac{-123}{128}=\frac{-56703}{59008}\)
Vì \(\frac{-58368}{59008}< \frac{-56703}{59008}\) nên \(\frac{-456}{461}< \frac{-123}{128}\)
