证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
证明不等式 1+2n+3n
n
证明不等式:(1/n)的n次方+(2/n)的n次方+……+(n/n)的n次方
证明(1+2/n)^n>5-2/n(n属于N+,n>=3)
2^n/n*(n+1)
数学不等式证明题n=1,2,……证明:(1/n)^n+(1/2)^n+……+(n/n)^n第二个是(2/n)^n
证明对任意正整数n,不等式ln(1/n+1)>1/n^2-1/n^3
用数学归纳法证明(2^n-1)/(2^n+1)>n/(n十1)(n≥3,n∈N+)
证明:1+2C(n,1)+4C(n,2)+...+2^nC(n,n)=3^n .(n∈N+)
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
化简(n+1)(n+2)(n+3)