Chứng minh C=1/4^2+1/6^2+1/8^2+...+1/(2n)^2 < 1/4
Cmr:
C=1/42 + 1/62 + 1/82 +-+ 1/(2n)2 < 1/4
D= 2!/3! + 2!/4! + 2!/5! +-..+ 2!/n! < 1
Loga
Toán lớp 6
Chứng minh C=1/4^2+1/6^2+1/8^2+...+1/(2n)^2 < 1/4
Cmr:
C=1/42 + 1/62 + 1/82 +-+ 1/(2n)2 < 1/4
D= 2!/3! + 2!/4! + 2!/5! +-..+ 2!/n! < 1
