A=1/2.3+1/3.4+1/4.5+..+1/2014.2015
A=1/2-1/3+1/3-1/4+1/4-1/5+...+1/2014-1/2015
A=1/2-1/2015
A=2013/4030
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Các câu hỏi tương tự
tinh tong A=1.2+2.3+3.4+4.5+...+2014.2015
Tinh tong S =1/1.2+1/2.3+1/3.4+...+1/2014.2015+1/2015.2016
Tính nhanh
C=1.2+2.3+3.4+...+2014.2015
K=1.2+2.3+3.4+..+(n-1).n
D=1(1+2+3+......+2014)+(1.2+2.3+3.4+.....+2014.2015)
Tinh A = \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2014.2015}\)
A=1/2.3+1/3.4+1/4.5+...+1/99.100
A = 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6
a=1/1.2=1/2.3+1/3.4+1/4.5+....+1/49.5
tính tổng A=1/2.3+1/3.4+1/4.5+...1/25.26