=1/5-1/7 + 1/7 - 1/9 + 1/9 - 1/11+....+1/97-1/99
=1/5 -1/99
=....
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1/3x5+1/5x7+1/7x9+1/9x11+1/11x13
1/1x3+1/3x5+1/5x7+1/7x9=1/9x11
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11 = ?
1/3x5+1/5x7+1/7x9+...+1/97x99
1/5x7 + 1/7x9 + 1/9x11 + ...... + 1/2009 + 2011 + 1/X = 1/5 x 0,5
(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13)xy=3/5
tìm y:(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11)xy=2/3
\(\left(\frac{1}{1x3}+\frac{1}{3x5}+\frac{1}{5x7}+\frac{1}{7x9}+\frac{1}{9x11}\right)\)
tìm x biết: 1/5x7 + 1/7x9 + 1/9x11 +.........+ 1/2013x2015 + 1/x+2 = 202/2015
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