Question

 tính:

giúp mình với mn

Answer 1

\(=\dfrac{5}{3}\cdot\dfrac{7}{5}\cdot\dfrac{9}{7}\cdot...\cdot\dfrac{2013}{2011}=\dfrac{2013}{3}=671\)

Answer 2

\(C=\left(1+\dfrac{2}{3}\right).\left(1+\dfrac{2}{5}\right).\left(1+\dfrac{2}{7}\right)...\left(1+\dfrac{2}{2009}\right).\left(1+\dfrac{2}{2011}\right).\\ C=\dfrac{5}{3}.\dfrac{7}{5}.\dfrac{9}{7}...\dfrac{2011}{2009}.\dfrac{2013}{2011}.\\ C=\dfrac{5.7.9...2011.2013}{3.5.7...2009.2011}.\\ C=\dfrac{1.1.1...1.2013}{3.1.1...1.1}.\\ C=C=\dfrac{2013}{3}=671.\)