1/[n(n+1)(n+2)]的化简
1/[n(n+1)(n+2)]的化简
2^n/n*(n+1)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
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?
证明不等式:(1/n)的n次方+(2/n)的n次方+……+(n/n)的n次方
(n+1)+n+(n-1)+(n-2)…+3+2+1怎么化简
9n^2+3n-2怎样化简为(3n-1)(3n+2)
排列组合 C(0 n)+C(1 n)+C(2 n)+...+C(n-1 n)+C(n n)(n∈N*)的值,并证明你的结
1\n(n+3)+1\(n+3)(n+6)+1\(n+6)(n+9)=1\2 n+18 n为正整数,求n的值
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
求1/n^2+1+2/n^2+2+...+n/n^2+n^2的极限,
若n²+3n=1,求n(n+1)(n+2)+1的值.