N 1 2 3 4 5
lim 9^n+4^n+2/5^n-3^2n-1 n趋于无穷大时
一道数列求和题1/2n+3/4n+5/8n+...+(2n-1)/n*2^n
已知888个连续正整数之和:n+(n+1)+(n+2)+(n+3)+(n+4)+(n+5)+(n+6)+(n+7)+··
Sn=n(n+2)(n+4)的分项等于1/6[n(n+2)(n+4)(n+5)-(n-1)n(n+2)(n+4)]吗?
化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)
(n+1)(n+2)/1 +(n+2)(n+3)/1 +(n+3)(n+4)/1
证明(1+2/n)^n>5-2/n(n属于N+,n>=3)
M=(N-1)×1+(N-2)×2+(N-3)×4+(N-4)×8+(N-5)×16+(N-6)×32+(N-7)×64
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
用夹逼准则和重要极限两种方法计算极限lim(2^n+3^n+4^n+5^n+6^n)^(1/n)n趋近于...
lim((5^n-4^(n-1))/((5^(n+1)+3^(n+2)) n→∞时的极限是多少?
证明:1+2C(n,1)+4C(n,2)+...+2^nC(n,n)=3^n .(n∈N+)