(2n+5)(3n-3)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
证明(1+2/n)^n>5-2/n(n属于N+,n>=3)
如果正整数n使得[n/2]+[n/3]+[n/4]+[n/5]+[n/6]=69,则n=
如果正整数n使得[n/2]+[n/3]+[n/4]+[n/5]+[n/6]=69,则n为( ).([ n ]表示不超过n
lim 9^n+4^n+2/5^n-3^2n-1 n趋于无穷大时
若n为正整数,求(3^n*2^n*5^n)/(-30)^n的值
初一计算:(m+5n)(m-n)-6(m+2n)(n-3n)?
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
极限3n^2-5/2n^2+n
lim(3^2n+5^n)/(1+9^n)
(n-m)^3×(m-n)^2-(m-n)^5
因式分解(n-m)^3(m-n)^2-(m-n)^5