编程计算1-1/3!+1/5!-1/7!+...+(-1)^(n-1)/(2n-1)!,其中n的值在程序运行时由键盘输入.

就给个循环
s=0
for(i=1,in;i++)

{
s=s+(-1)^(i-1)/(2i-1)
}

a=2,b=1
for i =1 to n
s=s+a/b
b=a
a=a+b
next

晚上给你

Dim a As Long, b As Long, c As Long
Dim n As Long, i As Long, s As Double
a = 2
b = 1
n = Val(InputBox(请输入n值))
For i = 1 To n
s = s + a / b
c = a
a = a + b
b = c
Next
MsgBox 和是 & s

这应该是网络信息 mAC地址