Question

[๖ۣۜBá ๖ۣۜVươηɠ]

So sánh: \(A=\frac{2005^{2005}+1}{2005^{2006}+1};B=\frac{2005^{2004}+1}{2005^{2005}+1}\)

Answer 1

[Hoàng Phương Mai]

\(A=\frac{2005^{2005}+1}{2005^{2006}+1}\)

\(\Rightarrow2005A=\frac{2005^{2006}+2005}{2005^{2006}+1}\)

\(\Rightarrow2005A=1+\frac{2004}{2005^{2006}+1}\)

\(B=\frac{2005^{2004}+1}{2005^{2005}+1}\)

\(\Rightarrow2005B=\frac{2005^{2005}+2005}{2005^{2005}+1}\)

\(\Rightarrow2005B=1+\frac{2004}{2005^{2005}+1}\)

Ta thấy \(\frac{2004}{2005^{2005}+1}>\frac{2004}{2005^{2006}+1}\)

Suy ra \(1+\frac{2004}{2005^{2005}+1}>1+\frac{2004}{2005^{2006}+1}\)

hay 2005B>2005A

Vậy B>A