1,2 : : 1307

2014 25:

Cos(x/5)*(1+x)^1/2-x

()

Imports System.MathPublic Class Form1

Public Function f1(ByVal x As Double)

Return Cos(x / 5) * (1 + x) ^ 1 / 2 - x

End Function Sub resh(ByVal exp As Double, ByRef a As Double, ByRef b As Double)

Dim n As Integer Dim c As Double Dim t1 As Double Dim t2 As Double n = 0

ListBox2.Items.Add(a)

ListBox3.Items.Add(b)

c = (a + b) / 2

Do While Abs(b - a) >= exp

n = n + 1

t1 = f1(c)

t2 = f1(b)

If t1 * t2 < 0 Then a = c

Else b = c

End If ListBox2.Items.Add(a)

ListBox3.Items.Add(b)

t1 = f1(a) : t2 = f1(b)

ListBox4.Items.Add(t1)

ListBox5.Items.Add(t2)

c = (a + b) / 2

Loop TextBox4.Text = Str(c)

t1 = f1(c)

TextBox5.Text = Str(t1)

TextBox6.Text = Str(n)

End Sub Private Sub Button1_Click(ByVal sender As System.Object, _ByVal e As System.EventArgs) Handles Button1.Click

Dim a, b, exp As Double a = CStr(TextBox1.Text)

b = CStr(TextBox2.Text)

exp = CStr(TextBox3.Text)

resh(exp, a, b)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, _ByVal e As System.EventArgs) Handles Button2.Click

End End Sub

End Classnxf(x)

0.14 1.03125-3.71*10^(-1)

0.017 1.00390625-2.2*10^(-1)

0.00110 1.00048828125-2*10^(-1)

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