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a, \(\frac{1}{2009}+\frac{2}{2009}+...+\frac{2008}{2009}\\ \frac{\left(1+2008\right)\cdot2008\div2}{2009}=\frac{2017036}{2009}\)
\(a-b+c+d=\frac{2008}{2009}-\frac{2009}{2008}+\frac{1}{2009}+\frac{2007}{2008}\)
\(=\left(\frac{2008}{2009}+\frac{1}{2009}\right)-\left(\frac{2009}{2008}-\frac{2007}{2008}\right)\)
\(=1-\frac{2}{2008}\)
\(=\frac{1003}{1004}\)
=2008/2009-2009/2008+1/2009+2007/2008
=(2008/2009+1/2009)-(2009/2008-2007/2008)
=1-1/1004
=1003/1004
\(\frac{2008}{2009}-\frac{2009}{2008}+\frac{1}{2009}+\frac{2007}{2008}\)
=\(\left(\frac{2008}{2009}+\frac{1}{2009}\right)-\left(\frac{2009}{2008}-\frac{2007}{2008}\right)\)
=\(1-\frac{2}{2008}\)
=\(1-\frac{1}{1004}\)
=\(\frac{1003}{1004}\)
Chúc bn làm tốt nha!!!
\(\frac{2008}{2009}-\frac{2009}{2008}+\frac{1}{2009}+\frac{2007}{2008}=\frac{1003}{1004}\)
ai k mình mình k lại,ok
A = 2019 x 2018 x 1001 x (2019 - 2008 )/2008 x 2007 x 1001
= 2019 x 2018 x 1001 / 2008 x 2017 x 1001 = 2019/2017
A = 2009 x 2008 x 1001 x ( 2008 - 2009 ) / 2008 x 2007 x 1001
= 2009 x 2008 x 1001 x (-1) / 2008 x 2007 x 1001 = -2009 / 2007