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7245 - 7244 = 7244(72-1)=7244.71
7244 - 7243 = 7243(72-1)=7243.71
7245- 7244 > 7244 - 7243
1 ) Ta có : \(2^{332}< 2^{333}=\left(2^3\right)^{111}=8^{111}\)
\(2^{223}>3^{222}=\left(3^2\right)^{111}=9^{111}\)
Vì : \(8^{111}< 9^{111}\)
\(\Rightarrow2^{332}< 3^{223}\)
2 ) Ta có : \(\left(222^3\right)^{111}=\left(2.111\right)^3=8.111^3\)
\(3^{222}=\left(333^2\right)^{111}=\left(3.111\right)^2=9.111^2\)
Vì : \(8.111^2< 9.111^2\)
\(\Leftrightarrow2^{333}< 3^{222}\)
1. Ta có:
\(2^{332}< 2^{333}=\left(2^3\right)^{111}=8^{111}\)
\(3^{223}>3^{222}=\left(3^2\right)^{111}=9^{111}\)
Vì \(8^{111}< 9^{111}\) nên \(2^{332}< 8^{111}< 9^{111}< 3^{223}\Rightarrow2^{332}< 3^{223}\)
Vậy \(2^{332}< 3^{223}\)
2. Ta có:
\(2^{333}=\left(2^3\right)^{111}=8^{111}\)
\(3^{222}=\left(3^2\right)^{111}=9^{111}\)
Vì \(8^{111}< 9^{111}\) nên \(2^{333}< 3^{222}\)
Vậy \(2^{333}< 3^{222}\)
Ta có : \(2^{333}=\left(2^3\right)^{111}=8^{111}\)
\(3^{222}=\left(3^2\right)^{111}=9^{111}\)
Do : \(8^{111}< 9^{111}\left(8< 9\right)\)
\(\Rightarrow2^{333}< 3^{222}\)
2\(^{91}\)>2\(^{90}\)=(2\(^5\))\(^{18}\)=32\(^{18}\)>25\(^{18}\)=(5\(^2\))\(^{18}\)=5\(^{36}\)>5\(^{35}\)
Vậy 2\(^{91}\)>5\(^{35}\)
ta có:
2^91 = (2^13)^7 = 8192^7
5^35 = (5^5)^7 = 3125^7
Vì 8192^7 > 3125^7 nên 2^91 > 5^35
Đặt \(A=\dfrac{1}{3}+\dfrac{1}{3^2}+...+\dfrac{1}{3^{2011}}+\dfrac{1}{3^{2012}}\)
\(\Rightarrow\dfrac{1}{3}A=\dfrac{1}{3^2}+\dfrac{1}{3^3}+...+\dfrac{1}{3^{2012}}+\dfrac{1}{3^{2013}}\)
\(\Rightarrow A-\dfrac{1}{3}A=\dfrac{1}{3}+\dfrac{1}{3^2}+...+\dfrac{1}{3^{2011}}+\dfrac{1}{3^{2012}}-\dfrac{1}{3^2}-\dfrac{1}{3^3}-...-\dfrac{1}{3^{2012}}-\dfrac{1}{3^{2013}}\)\(\Rightarrow\dfrac{2}{3}A=\dfrac{1}{3}-\dfrac{1}{3^{2013}}< \dfrac{1}{3}\)
\(\Rightarrow\dfrac{2}{3}A< \dfrac{1}{3}\)
\(\Rightarrow A< \dfrac{1}{3}.\dfrac{3}{2}=\dfrac{1}{2}\)
Vậy \(\dfrac{1}{3}+\dfrac{1}{3^2}+...+\dfrac{1}{3^{2011}}+\dfrac{1}{3^{2012}}< \dfrac{1}{2}\)
Ta có: 2^91=(2^13)^7=8192^7
5^35=(5^5)^7=3125^7
Vậy 2^91>5^35
\(3>2\)
\(=>3^{24680}>2^{24680}\)
mà \(2^{24680}>2^{3720}\)
\(=>3^{24680}>2^{3720}\)
Ta có :
324680 > 224680
Vì 3 > 2
Mà 224680 > a3720
=> 324680 > 224680 > a3720
Vậy 324680 > 23720