求证1/1²+1/2²+…+1/n²
设n∈N+,求证:1/1²+1/2²+……+1/n²≤2-1/n
求证:1²+2²+3²+……+n²=[n(n+1)(n+2)]/6
求证1²+2²+3²+……+n²=(1/6*n(n+1)(2n+1))/n(n为
(1) 求证:n
数学求证问题 :求证1²+2²+3²+4²+.+n²的通项公式
求证Cn0Cn1+Cn1Cn2+……+Cn(n-1)Cnn=(2n)!/(n-1)!(n+1)!
求证(1+1/2²)(1+1/3²)……(1+1/n²)<e,其中n∈N*
设n∈N,n>1.求证:logn (n+1)>log(n+1) (n+2)
求证:3/2-1/n+1
求证1×2+2×3+3×4+…+n(n+1)=13n(n+1)(n+2)
数列A1=1/3,An+1=An+An²/n²求证An>1/2+1/4n
求证1/(n+1)+1/(n+2)+.+1/(3n+1)>1 [n属于N*]