= 3553566366 / 2653754785373573735
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= 3553566366 / 2653754785373573735
1 / 2001x2003 + 1/2003x2005 + 1/2005x2007 +...+ 1/2011x2013
2012x2013-1
A=______________
2011x2013+2012
2012x2013-1
___________
2011x2013+2012
2013 x X + X x 1/2013 - 2013 = 1/2013
Tính A = \(\frac{1}{5x7}\)+ \(\frac{1}{7x9}\)+ \(\frac{1}{9x11}\)+...+ \(\frac{1}{2011x2013}\)
Giúp mình với. Thanks
2013*x+x*1/2013-2013=1/2013
2013x y + y x 1/2013 - 2013=1/2013
(1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 +........– 98 + 99) x (2013 x 6 – 2013 – 2013 x 5)
2011x2013-2012x2011 tính nhanh
____________________
2011x2012+2011x2013