Question

Chứng minh rằng : A < 2

A = 1/1^2 + 1/2^2 + 1/3^2 +....+ 1/50^2

Answer 1

\(A=\frac{1}{1^2}+\frac{1}{2^2}+\frac{1}{3^2}+...+\frac{1}{50^2}

Answer 2

giai thich gio hon duoc ko