Các câu hỏi tương tự
2/1.3 + 2/3.5 + 2/5.7 + ... + 2/2015.2017
Tính nhanh:
1.3+3.5+5.7 +......+2015.2017
1/1.3+1/3.5+1/5.7+....+1/2015.2017
2016/1.3 + 2016/3.5 + 2016/5.7 +...+ 2016/2015.2017=?
-2/1.3-2/3.5-2/5.7-2/7.9-.....-2/2015.2017-1/27
\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{2015.2017}\)
Tính tổng :
M = \(\frac{4}{1.3}+\frac{4}{3.5}+\frac{4}{5.7}+.......+\frac{4}{2015.2017}\)
\(ChoA=\left(1+\frac{1}{1.3}\right).\left(1+\frac{1}{3.5}\right).\left(1+\frac{1}{5.7}\right).....\left(1+\frac{1}{2015.2017}\right)\)
Tính tổng các ps sau
a,\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2017.2018}\)
b,\(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{2015.2017}\)