1.N+3N-12>或=8 2.2n>-8 3.3n+3
-n^3+8n^2-16n
简算:1.[(1*2*4+2*4*8+L+n.2n.4n)/(1*3*9+2*6*18+L=n.3n.9n)]^22.(
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
极限练习题lim(n->∞)[(n^2+3n-8)/(4n^2+2n+3)]
求1.lim(3n-(3n^2+2n)/(n-1)) 2.lim(8+1/(n+1)) 3.lim根号n(根号(n+1)
M=(N-1)×1+(N-2)×2+(N-3)×4+(N-4)×8+(N-5)×16+(N-6)×32+(N-7)×64
已知Sn=2+5n+8n^2+…+(3n-1)n^n-1(n∈N*)求Sn
求证:n的n+1次方大于n+1的n次方(n大于或等于3,n属于N)
1 + (n + 1) + n*(n + 1) + n*n + (n + 1) + 1 = 2n^2 + 3n + 3
一道数列求和题1/2n+3/4n+5/8n+...+(2n-1)/n*2^n
证明(1+2/n)^n>5-2/n(n属于N+,n>=3)
计算1/(m-n)-1/(m+n)-2n/(m^2+n^2)-4n^3/(m^4+n^4)-8n^7/(m^8+n^8)