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a;
- \(\dfrac{5}{8}\) = \(\dfrac{-35}{56}\); \(\dfrac{6}{-7}\) = \(\dfrac{-48}{56}\)
Vì \(\dfrac{-35}{56}\) > \(\dfrac{-48}{56}\)
Nên \(\dfrac{-5}{8}\) > \(\dfrac{6}{-7}\)
b; \(\dfrac{2018}{2019}\) = 1 - \(\dfrac{1}{2019}\)
\(\dfrac{2019}{2020}\) = 1 - \(\dfrac{1}{2020}\)
Vì \(\dfrac{1}{2019}\) > \(\dfrac{1}{2020}\)
Nên \(\dfrac{2018}{2019}\) < \(\dfrac{2019}{2020}\)
c; \(\dfrac{13}{53}\) = \(\dfrac{247}{1007}\)
\(\dfrac{19}{75}\) = \(\dfrac{247}{975}\)
Vì \(\dfrac{247}{1007}\) < \(\dfrac{247}{975}\)
Vậy \(\dfrac{13}{53}\) < \(\dfrac{19}{75}\)
d; \(\dfrac{91}{77}\) = \(\dfrac{13}{11}\) = \(\dfrac{1339}{1133}\)
\(\dfrac{119}{103}\) = \(\dfrac{1309}{1133}\)
Vì \(\dfrac{1339}{1133}>\dfrac{1309}{1133}\)
Vậy \(\dfrac{91}{77}\) > \(\dfrac{119}{103}\)