Question

Bài toán 1. So sánh: 2009²⁰ và 20092009¹⁰

Bài toán 2. Tính tỉ số , biết:

Answer 1

2:

\(B=\left(1+\dfrac{2007}{2}\right)+\left(1+\dfrac{2006}{3}\right)+...+\left(1+\dfrac{2}{2007}\right)+\left(1+\dfrac{1}{2008}\right)+1\)

\(=\dfrac{2009}{2}+\dfrac{2009}{3}+...+\dfrac{2009}{2007}+\dfrac{2009}{2008}+\dfrac{2009}{2009}\)

\(=2009\left(\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{2007}+\dfrac{1}{2008}+\dfrac{1}{2009}\right)\)

=2009A

=>A/B=1/2009

1:

\(2009^{20}=\left(2009^2\right)^{10}=4036081^{10}\)

4036081<20092009

=>4036081^10<20092009^10

=>2009^20<20092009^10