1/2 n(n+1)+1/3 n(n+1)(n-1)=1 /6 ×n(n+1)(2n+1)谁能告诉我这是怎样来的 要详细的解
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![1/2 n(n+1)+1/3 n(n+1)(n-1)=1 /6 ×n(n+1)(2n+1)谁能告诉我这是怎样来的 要详细的解](/uploads/image/z/14856423-15-3.jpg?t=1%2F2+n%EF%BC%88n%2B1%EF%BC%89%2B1%2F3+n%EF%BC%88n%2B1%EF%BC%89%EF%BC%88n-1%EF%BC%89%3D1+%2F6+%C3%97n%EF%BC%88n%2B1%EF%BC%89%EF%BC%882n%2B1%EF%BC%89%E8%B0%81%E8%83%BD%E5%91%8A%E8%AF%89%E6%88%91%E8%BF%99%E6%98%AF%E6%80%8E%E6%A0%B7%E6%9D%A5%E7%9A%84+%E8%A6%81%E8%AF%A6%E7%BB%86%E7%9A%84%E8%A7%A3)
1/2 n(n+1)+1/3 n(n+1)(n-1)=1 /6 ×n(n+1)(2n+1)谁能告诉我这是怎样来的 要详细的解
1/2 n(n+1)+1/3 n(n+1)(n-1)=1 /6 ×n(n+1)(2n+1)谁能告诉我这是怎样来的 要详细的解
1/2 n(n+1)+1/3 n(n+1)(n-1)=1 /6 ×n(n+1)(2n+1)谁能告诉我这是怎样来的 要详细的解
1/2 n(n+1)+1/3 n(n+1)(n-1)
=n(n+1)[1/2+1/3(n-1)]
=n(n+1)(1/3n+1/6)
=1/6n(n+1)(2n+1)
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
2^n/n*(n+1)
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
[3n(n+1)+n(n+1)(2n+1)]/6+n(n+2)化简
化简n分之n-1+n分之n-2+n分之n-3+.+n分之1
化简n分之n-1+n分之n-2+n分之n-3+.+n分之1
化简(n+1)(n+2)(n+3)
2n/(n+1)n!
当n为正偶数,求证n/(n-1)+n(n-2)/(n-1)(n-3)+...+n(n-2).2/(n-1)(n-3)...1=n
1*N+2*(N-1)+3*(N-2)+...+N*1=1/6N(N+1)(N+2)
(n+2)!/(n+1)!
判断 当n>1时,n*n*n>3n.( )
lim2^n +3^n/2^n+1+3^n+1
n(n+1)(n+2)(n+3)+1 因式分解
n(n+1)(n+2)(n+3)+1等于多少
3(n-1)(n+3)-2(n-5)(n-2)
lim(n+3)(4-n)/(n-1)(3-2n)
lim(n^3+n)/(n^4-3n^2+1)