2A = [1/1.2-1/2.3]+[1/2.3-1/3.4]+...+[1/2014.2015-1/2015.2016]
2A = 1/1.2-1/2.3+1/2.3-1/3.4+...+1/2014.2015-1/2015.2016
2A = 1/1-1/2015.2016
2A = 2015.2016-1/2015.2016
A = \(\frac{\left[2015.2016-1\right]:2}{2015.2016}=0.4999998769\)
P = 1/1.2.3 + 1/2.3.4 + 1/3.4.5 +...+ 1/n(n+1)(n+2)
S = 1/1.2.3 + 1/2.3.4 + 1/3.4.5 +...+ 1/48.49.50 .
P=1/1.2.3+1/2.3.4+1/3.4.5+...+1/10.11.12
1/1.2.3+1/2.3.4+1/3.4.5+...+1/37.38.39
1/1.2.3+1/2.3.4+1/3.4.5+.....1/2013.2015.2016
1/1.2.3 + 1/2.3.4 + 1/3.4.5+...+1/98.99.100 = ?
1/1.2.3 + 1/2.3.4 + 1/3.4.5 + ...+1/98.99.100 =?
1/1.2.3+1/2.3.4+1/3.4.5+....+1/37.38.39 = ?
1/1.2.3+1/2.3.4+1/3.4.5+...+1/37.38.39
1/1.2.3+1/2.3.4+1/3.4.5+...+1/37.38.39
