1+2/1+3/1+.+n/1 2/1+4/1+.+2n/1 用VB编码编程.

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1+2/1+3/1+.+n/1 2/1+4/1+.+2n/1 用VB编码编程.
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1+2/1+3/1+.+n/1 2/1+4/1+.+2n/1 用VB编码编程.
1+2/1+3/1+.+n/1 2/1+4/1+.+2n/1 用VB编码编程.

1+2/1+3/1+.+n/1 2/1+4/1+.+2n/1 用VB编码编程.
2/1?是你写错了还是我看错了?确定是一分之二?不是二分之一?那不就等于2嘛?
1+2/1+3/1+.+n/1 = 1+2+3+.+n
代码：
Dim i As Long,n As Long,s As Long
n = Val(Inputbox("请输入n值"))
For i = 1 To n
s = s + i
Next
MsgBox "1+2/1+3/1+.+n/1 的值是" & s
2/1+4/1+.+2n/1 = 2+4+.+2n
代码：
Dim i As Long,n As Long,s As Long
n = Val(Inputbox("请输入n值"))
For i = 2 To 2 * n Step 2
s = s + i
Next
MsgBox "2/1+4/1+.+2n/1 的值是" & s

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) 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 (n+2)!/(n+1)! 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) lim[(n+3)/(n+1))]^(n-2) 【n无穷大】 lim(2^n+3^n)^1 (n趋向无穷) 级数n/(n+1)(n+2)(n+3)和是多少