绝对值是“|”，可以直接显示，同理对数可用log(x)代替，根号和其他不支持显示。
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如果要显示数学式子，只能画吧。
计算时可用“^”求幂或求根，“/”表示除法和分数线，还有math类。
VB的运算顺序是：先乘除、后加减，有括号的先算括号内，有负号的先算负号。
请你比较一下这个运算中x和y的值：
Dim n As Single = 4
Dim x As Single
Dim y As Single
x = n + 1
x = x / n
x = x - 1
x = Math.Sqrt(x)
y = Math.Sqrt((n + 1) / n - 1)
这样就会发现，你的代码中括号的位置错了。
正确的应该是： Math.Sqrt((n + 1) / n - 1)
效果如图，代码如下：
Public Class Form1
'Circle类
Class Circle
Public Center As Point
Public Radius As Single
Public Sub New(c As Point, r As Single)
Center = c
Radius = r
End Sub
'绘制
Public Sub Draw(g As Graphics, pen As Pen)
g.DrawEllipse(pen, New RectangleF(Center.X - Radius, Center.Y - Radius, Radius * 2, Radius * 2))
End Sub
End Class
Private downPoint As Point '记录鼠标按下位置
Private circleList As New List(Of Circle) '已存放圆的列表
Private tmpCircle As Circle '临时圆（正在拖动）
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
DoubleBuffered = True '启用双缓冲绘图，避免闪烁
End Sub
Private Sub Form1_MouseDown(sender As Object, e As MouseEventArgs) Handles Me.MouseDown
downPoint = e.Location '记下位置
End Sub
Private Sub Form1_MouseMove(sender As Object, e As MouseEventArgs) Handles Me.MouseMove
If e.Button Windows.Forms.MouseButtons.Left Then Return '左键没按下则退出
Dim r As Single = Math.Sqrt((e.X - downPoint.X) ^ 2 + (e.Y - downPoint.Y) ^ 2) '算出半径
tmpCircle = New Circle(downPoint, r) '更新临时圆
Refresh() '先刷新掉之前绘制的临时圆
tmpCircle.Draw(Me.CreateGraphics, Pens.Black) '绘制临时圆
End Sub
Private Sub Form1_MouseUp(sender As Object, e As MouseEventArgs) Handles Me.MouseUp
circleList.Add(tmpCircle) '鼠标弹起，把临时圆加入圆列表
End Sub
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
For Each c As Circle In circleList
c.Draw(e.Graphics, Pens.Black) '绘制出每个圆
Next
End Sub
End Class
首先，要知道3次根号下 x ，就是x^(1/3)，知道这个就可以写代码了： private sub form_load() x=inputbox("请输入要开三次方的数值") msgbox x^(1/3) end sub
