1/2+3/4+5/8+……+2n+1/2^n化简
化简(1*3*4+2*6*8……n*3n*4n)/(1*3*5+2*8*10+……n*4n*5n)
(1/(n^2 n 1 ) 2/(n^2 n 2) 3/(n^2 n 3) ……n/(n^2 n n)) 当N越于无穷大
用数学归纳法证明:1×2×3+2×3×4+…+n×(n+1)×(n+2)=n(n+1)(n+2)(n+3)4(n∈N
lim(1/n^2+4/n^2+7/n^2+…+3n-1/n^2)
化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)
1*3*4+2*6*8+………+n*3n*4n / 1*4*5+2*8*10+………+n*4n*5n
已知Sn=2+5n+8n^2+…+(3n-1)n^n-1(n∈N*)求Sn
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
化简:4n+3×4n-1+32×4n-2+…+3n-1×4+3n.
一道数列求和题1/2n+3/4n+5/8n+...+(2n-1)/n*2^n
化简(n+1)(n+2)(n+3)