Question

\(A=\frac{1}{1x2x3}+\frac{1}{2x3x4}+...+\frac{1}{36x37x38}+\frac{1}{37x38x39}\)

Tìm A

Answer 1

\(A=\frac{370}{741}\)

Answer 2

A=\(\frac{370}{741}\)