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\(\frac{2011}{2010}\times\frac{2012}{2011}\times\frac{2013}{2012}\times\frac{2014}{2013}\times\frac{1005}{1007}\)
\(=\frac{2014}{2010}\times\frac{1005}{1007}\)
\(=\frac{2\times1007\times1005}{2\times1005\times1007}\)
\(=1\)
= 2011 x 2012 + 2011 x 2 / 2013 x 2014 - 2014 x 2
= 2011 x 2014 / 2014 x 2011 = 1
k mk nha
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010}{2011}}{\frac{2012}{2013}}+\frac{\frac{2011}{2012}}{\frac{2013}{2014}}+\frac{\frac{2012}{2013}}{\frac{2014}{2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2013}}{\frac{2012+2013+2014}{2013+2014+2015}}$
$\frac{\frac{2010+2011+2012}{2011+2012+2013}}{\frac{2012}{2013}+\frac{2013}{2014}+\frac{2014}{2015}}$
Ta có: \(1-\frac{2011}{2012}=\frac{1}{2012}\)
\(1-\frac{2013}{2014}=\frac{1}{2014}\)
Có: \(\frac{1}{2012}>\frac{1}{2014}\)
\(\Rightarrow\frac{2011}{2012}< \frac{2013}{2014}\)
Mk so sánh khoảng cách của các số đến 1.
\(1-\frac{2011}{2012}=\frac{1}{2012}\)
\(1-\frac{2013}{2014}=\frac{1}{2014}\)
Vì: \(2012< 2014\) nên \(\frac{2011}{2012}< \frac{2013}{2014}\)
(2011 × 2012 + 4022) /(2013 × 2014 - 4028)= 0
(2011 × 2012 + 4022) /(2013 × 2014 - 4028)=1