\(\frac{19^{30}+5}{19^{31}+5}\)và \(\frac{19^{31}+5}{19^{32}+5}\)
Xét biểu thức \(\frac{19^{30}+5}{19^{31}+5}\)là A và biểu thức \(\frac{19^{31}+5}{19^{32}+5}\)là B
\(B=\frac{19^{31}+5}{19^{32}+5}< \frac{19^{31}+5+14}{19^{32}+5+14}\)
\(=\)\(\frac{19^{31}.19}{19^{32}.19}\)\(=\)\(\frac{19.\left(19^{30}+1\right)}{19.\left(19^{31}+1\right)}\)
\(=\)\(\frac{19^{30}+1}{19^{31}+1}\)
Mà \(\frac{19^{30}+1}{19^{31}+1}< \frac{19^{30}+5}{19^{31}+5}\)
Nên \(A>B\)