Question

[Đinh Cao Bảo Hà]

Tính 

A = 1/4 + 1/12 + 1/36 + ....... + 1/972 + 1/ 2916

Answer 1

[Đoàn Đức Hà]

\(A=\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+...+\frac{1}{972}+\frac{1}{2916}\)

\(3A=\frac{3}{4}+\frac{1}{4}+\frac{1}{12}+...+\frac{1}{324}+\frac{1}{972}\)

\(3A-A=\left(\frac{3}{4}+\frac{1}{4}+\frac{1}{12}+...+\frac{1}{324}+\frac{1}{972}\right)-\left(\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+...+\frac{1}{972}+\frac{1}{2916}\right)\)

\(2A=\frac{3}{4}-\frac{1}{2916}\)

\(A=\frac{1093}{2916}\)