\(< \frac{1}{2}+\frac{1}{3}+..........+\frac{1}{2012}+\frac{1}{2013}>\times x=\frac{2012}{1}+\frac{2011}{2}+.............+\frac{2}{2011}+\frac{1}{2012}\)

Giúp mình nhé rồi mình tick cho

\(\frac{1}{2+\sqrt{2}}+\frac{1}{3\sqrt{2}+2\sqrt{3}}+\frac{1}{4\sqrt{3}+3\sqrt{4}}+\frac{1}{5\sqrt{4}+4\sqrt{5}}+.....+\frac{1}{2012\sqrt{2011}+2011\sqrt{2012}}\)

rút gọn giúp mình với

So sánh

a)
\(A=\frac{2011^{2012}+4}{2011^{2012}-1}\)với \(B=\frac{2011^{2012}+1}{2011^{2012}-4}\)

b)

\(S=\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+...+\frac{1}{3^{2012}}\)với \(\frac{1}{2}\)

\(choA=\frac{2012+\frac{2011}{2}+\frac{2010}{3}+\frac{2009}{4}+...+\frac{1}{2012}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2012}+\frac{1}{2013}}.hỏiAchia3dưbaonhiêu\)

So sánh P và Q biết : P = 2010/2011 + 2011/2012 + 2012/2013 và Q = 2010+2011+2012/ 2011 +2012+2013

Chứng tỏ N < 1 với N = \(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{2009^2}+\frac{1}{2010^2}\)

\(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\cdot\cdot\cdot+\frac{1}{2012}+\frac{1}{2013}}{\frac{2012}{1}+\frac{2011}{2}+\frac{2010}{3}+\frac{1}{2012}}\)

Tìm x biết:

\(\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{2012}+\frac{1}{2013}\right)\cdot x=\frac{2012}{1}+\frac{2011}{2}+\frac{2010}{3}+...+\frac{2}{2011}+\frac{1}{2012}\)

Tính giá trị biểu thức :

 \(A=\frac{\frac{1}{2013}+\frac{2}{2012}+\frac{3}{2011}+...+\frac{2011}{3}+\frac{2012}{2}+\frac{2013}{1}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)

Tính :

\(\frac{1+\frac{1}{2}+\frac{1}{3}+..........+\frac{1}{2011}+\frac{1}{2012}}{\frac{2013}{1}+\frac{2014}{2}+\frac{2015}{3}+..............+\frac{4023}{2011}+\frac{4024}{2012}}-2012\)