So sánh: 200920 và 2009200910
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ta có : \(2009^{20}=2009^{10}.2009^{10}\) ; \(20092009^{10}=2009^{10}.10001^{10}\)
Mà \(2009^{10}.2009^{10}\)<\(2009^{10}.10001^{10}\)
=> \(2009^{20}< 20092009^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:2009200910 = (2009.10001)10 = 200910.1000110 > 200910.200910 = 200920
\(2009^{20}=\left[\left(2009\right)^2\right]^{10}=4036081^{10}\)
mà \(4036081< 20092009\)
nên \(2009^{20}< 20092009^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2009²⁰ = (2009²)¹⁰ = 4036081¹⁰
Do 4036081 < 20092009
⇒ 4036081¹⁰ < 20092009¹⁰
Vậy 2009²⁰ < 20092009¹⁰
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2009^{20}=2009^{10}.2009^{10}\)
\(20092009^{10}=\left(10001.2009\right)^{10}=10001^{10}.2009^{10}\)
Vì \(2009^{10}=2009^{10}\) mà \(2009^{10}< 10001^{10}\) nên \(2009^{20}< 20092009^{10}\)
200920=200910.200910200920=200910.200910
2009200910=(10001.2009)10=1000110.2009102009200910=(10001.2009)10=1000110.200910
Vì 200910=200910200910=200910 mà 200910<1000110200910<1000110 nên 200920<2009200910
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(2009^{20}=\left(2009^2\right)^{10}=\left(2009\cdot2009\right)^{10}\)
\(20092009^{10}=\left(2009\cdot10001\right)^{10}\)
mà \(2009< 10001\)
nên \(2009^{20}< 20092009^{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:2009200910 = (2009.10001)10 = 200910.1000110 > 200910.200910 = 200920
200920200920 và 2009200910.2009200910.
Ta có:
200920=(20092)10=(2009.2009)10.200920=(20092)10=(2009.2009)10.
2009200910=(2009.10001)10.2009200910=(2009.10001)10.
Vì 2009.2009<2009.100012009.2009<2009.10001
⇒(2009.2009)10<(2009.10001)10⇒(2009.2009)10<(2009.10001)10
⇒200920<2009200910.
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1: Ta có 200920 = (20092)10 = (2009.2009)10
2009200910 = (10001.2009)10
Mà 2009 < 10001 ➩ (2009.2009)10 < (10001.2009)10
Vậy 200920 < 2009200910
Ta có:
\(2009^{20}=\left(2009^2\right)^{10}=\left(2009.2009\right)^{10}\)
\(20092009^{10}=\left(2009.10001\right)^{10}\)
Vì \(2009.2009< 2009.10001\)nên \(20009^{20}< 20092009^{10}\)
20092009=2009 x 10001
20092009 mũ 10 = 2009 mũ 10 x 10001 mũ 10
2009 mũ 20 = 2009 mũ 10 x 2009 mũ 10
10001 > 2009
vậy 20092009 mũ 10 lớn hơn 2009 mũ 20