tinh tong:
S=1/1.2+1/2.3+1/3.4+...+1/2011.2012
Tinh tong: S= 1/1.2 + 1/2.3+ 1/ 3.4 ..... + 1/9.10?
Tinh tong S =1/1.2+1/2.3+1/3.4+...+1/2014.2015+1/2015.2016
(1-1/1.2)+(1-1/2.3)+...+(1-1/2011.2012)
Tính tổng S=1.2+2.3+3.4+4.5+...+2011.2012
Bài 15 tính tổng a) A= 1/1.2 +1/2.3 +1/3.4 +...+1/2011.2012 b) B= 1/2.4 +1/4.6 + 1/6.8+.,.......+1/2010.2012
tinh tong S=1.2+2.3+3.4+...............+99.100
Tinh tong S=1.2+2.3+3.4+4.5+...+99.100
tinh tong S = 1.2 + 2.3 + 3.4 + ...............+ 99. 100
