B) Ta có : \(1-\frac{1998}{1999}=\frac{1}{1999};1-\frac{1999}{2000}=\frac{1}{2000}\)
Vì 1999 < 2000 nên \(\frac{1}{1999}>\frac{1}{2000}\)
Hay \(\frac{1998}{1999}>\frac{1999}{2000}\)
A) Ta có : \(1-\frac{13}{27}=\frac{14}{27};1-\frac{27}{41}=\frac{14}{41}\)
Vì 27 < 41 nên \(\frac{1}{27}>\frac{1}{41}\)
Hay \(\frac{13}{27}>\frac{27}{41}\)