Các câu hỏi tương tự
cho A= 1/1^2+1/2^2+1/3^2+...+1/50^2.CMR A<2
A=1/1*1 + 1/2*2 +1/3*3 + ... 1/50*50
A=1/1^2+1/2^2+1/3^2+1/4^2+...+1/50^2
A=1/1^2+1/2^2+1/3^2+1/4^2+...+1/50^2
A=1/1^2+1/2^2+1/3^2+...+1/50^2
Cho A=1/1^1+1/2^2+1/3^2+1/4^2+......+1/50^2. Chứng minh A<2.
Cho A = 2 1 1 + 2 2 1 + 2 3 1 + 2 4 1 +…+ 2 50 1 . chứng minh A< 2
Cho A=1/1^2+1/2^2+1/3^2+1/4^2+...+1/50^2. Chứng minh A<2
CMR A<2
A=1/1^2+1/2^2+1/3^2+.....+1/50^2