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ta có :
\(10A=\frac{10^{2014}+10}{10^{2014}+1}=\frac{\left(10^{2014}+1\right)+9}{10^{2014}+1}=1+\frac{9}{10^{2014}+1}\)
\(10B=\frac{10^{2015}+10}{10^{2015}+1}=\frac{\left(10^{2015}+1\right)+9}{10^{2015}+1}=1+\frac{9}{10^{2015}+1}\)
ta thấy \(10^{2014}+1< 10^{2015}+1\Rightarrow\frac{9}{10^{2014}+1}>\frac{9}{10^{2015}+1}\Rightarrow10A>10B\Rightarrow A>B\)
\(A=\frac{98^{2015}+1}{98^{2014}+1}>1\)
Ta có:
\(A=\frac{98^{2015}+1+97}{98^{2014}+1+97}=\frac{98^{2015}+98}{98^{2014}+98}=\frac{98\left(98^{2014}+1\right)}{98\left(98^{2013}+1\right)}\)
\(=\frac{98\left(98^{2015}+1\right)}{98\left(98^{2014}+1\right)}=\frac{98^{2014}+1}{98^{2013}+1}\)
Ta thấy: \(\frac{98^{2014}+1}{98^{2013}+1}=B\)mà \(A>1\)
\(\Rightarrow A>B\)
\(A=\frac{98^{2015}+1}{98^{2014}+1}>1\)
Theo đề ta có:
\(A=\frac{98^{2015}+1+97}{98^{2014}+1+97}=\frac{98^{2015}+98}{98^{2014}+98}=\frac{98\left(98^{2014}+1\right)}{98\left(98^{2013}+1\right)}\)
\(=\frac{98\left(98^{2015}+1\right)}{98\left(98^{2014}+1\right)}=\frac{98^{2014}+1}{98^{2013}+1}\)
Lúc này ta thấy: \(\frac{98^{2014}+1}{98^{2013}+1}=B\)mà \(A>1\)
\(\Leftrightarrow A>B\).
a,A=2^0+2^1+2^2+...+2^2014
2A=2^1+2^2+2^3+...+2^2015
2A-A=(2^1+2^2+2^3+...+2^2015)-(2^0+2^1+2^2+...+2^2014)
A=2^2015-2^0=2^2015-1=B
=>A=B
b,A=2014.2016=2014.(2015+1)=2014.2015+2014
B=2015^2=2015.2015=(2014+1).2015=2014.2015+2015
Vì 2014<2015 => A<B.