谁帮忙编个VB题,我想半天没想明白这个式子应该怎么列.2、\x05设窗体上有一“计算”按钮Command1.运行时,单击“计算”按钮,用InputBox输入整数N,求3-6+9-12+…+(-1)(n+1)(3N),将结果直接显示于窗体上.

Question

谁帮忙编个VB题,我想半天没想明白这个式子应该怎么列.
2、\x05设窗体上有一“计算”按钮Command1.运行时,单击“计算”按钮,用InputBox输入整数N,求3-6+9-12+…+(-1)(n+1)(3N),将结果直接显示于窗体上.完成“计算”按钮的Click事件过程.（那个是（-1）的（n+1)次方（3N）.

Answer 1

Private Sub Command1_Click()Dim N As Long,I As Long,Sum As LongN = InputBox("请输入N的值","输入",5)Sum = 0For I = 1 To NSum = Sum + (-1) ^ (I + 1) * 3 * INext IPrint "当N为" & N & "时,结果为：" & SumE...