Rút Gọn
P=2013^2014-2013^2013/2013^2013-2013^2012
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\(P=\frac{2013^{2014}-2013^{2013}}{2013^{2013}-2013^{2012}}\)
\(=\frac{2013^{2013}\cdot\left(2013-1\right)}{2013^{2012}\cdot\left(2013\right)-1}\)
\(=\frac{2013^{2013}}{2013^{2012}}=2013\)
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}$
Ta thấy B=2012+2013/2013+2014<1(vì 2012+2013<2013+2014)
Ta có A=2012/2013+2013/2014
A=1-1/2013+1-1/2014
A=(1+1)-(1/2013+1/2014)
A=2-(1/2013+1/2014)
Mà 1/2013<1/2;1/2014<1/2
=>1/2013+1/2014<1/2+1/2=1
=>2-(1/2013+1/2014)>1
=>A>1
Mà B<1
=>A>B
\(B=\frac{2012+2013}{2013+2014}=\frac{2012}{2013+2014}+\frac{2013}{2013+2014}< \frac{2012}{2013}+\frac{2013}{2014}=A\)
Vậy B<A
\(P=\frac{2013^{2014}-2013^{2013}}{2013^{2013}-2013^{2012}}=\frac{2013}{1}=2013\)
P = 20132014-20132013/20132013-20132012
= 20132014 - 1 - 20132012
= 20132014 - 20132012 -1
= 2013(2014-2012) - 1
= 20132 -1
= 4052169 -1
= 4052168