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Public Class Form1
    Private Function OutData(ByVal Data() As Integer, ByVal Index1 As Integer,
                             ByVal Index2 As Integer) As Double
        'Константы
        Const x As Double = 0.25
        Const a As Double = 1.07
        Const c As Double = 0.2
        'Переменные
        Dim Out1 As Double = 0
        Dim Out2 As Double = 0
        'Цикл произведения_1
        For i As Integer = Index1 To Data.Length - 1
            Out1 = a * (Data(i) + x) ^ 2
            'Цикл произведения_2
            For j As Integer = Index2 To Data.Length - 1
                If i > Index1 Then
                    Exit For
                End If
                Out2 = c ^ 2 * (Data(j) + x) ^ 2
            Next
        Next
        'Результат
        Return Out1 + Out2
    End Function
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim N As Double = 0
        Dim B() As Integer = New Integer(8) {1, 2, 3, 4, 5, 6, 7, 8, 9}
        N = OutData(B, 2, 5)
        MsgBox("Результат: " & N)
    End Sub
End Class

    Function Func1(ByVal b() As Double, ByVal a As Double, ByVal x As Double, ByVal c As Double) As Double
        Dim result1 As Double = 1.0
        For i As Integer = 2 To b.GetUpperBound(0)
            result1 *= Math.Pow(b(i) + x, 2)
        Next
        result1 *= a
        Dim result2 As Double = 1.0
        For i As Integer = 5 To b.GetUpperBound(0)
            result2 *= Math.Pow(b(i) + x, 2)
        Next
        result2 *= Math.Pow(c, 2)
        Return result1 + result2
    End Function

 Private Function NoMame(ByVal b() As Double) As Double
        Const a = 1.07
        Const c = 0.2
        Const x = 0.25
        Dim Res1 As Double = 1.0
        Dim Res2 As Double = 1.0
        For i As Integer = 2 To b.Length - 1
            Res1 *= (b(i) + x) ^ 2
        Next
        Res1 *= a
        For j As Integer = 5 To b.Length - 1
            Res2 *= (b(j) + x) ^ 2
        Next
        Res2 *= c ^ 2
        Return Res1 + Res2
    End Function

Module Module1
 
    Sub Main()
    Private Function NoMame(ByVal b() As Double) As Double
        Const a = 1.07
        Const c = 0.2
        Const x = 0.25
        Dim Res1 As Double = 1.0
        Dim Res2 As Double = 1.0
        For i As Integer = 2 To b.Length - 1
            Res1 *= (b(i) + x) ^ 2
        Next
        Res1 *= a
        For j As Integer = 5 To b.Length - 1
            Res2 *= (b(j) + x) ^ 2
        Next
        Res2 *= c ^ 2
        Return Res1 + Res2
    End Function
    End Sub
 
End Module

Module Module1
    Sub Main()
 
    End Sub
    Private Function NoMame(ByVal b() As Double) As Double
        Const a = 1.07
        Const c = 0.2
        Const x = 0.25
        Dim Res1 As Double = 1.0
        Dim Res2 As Double = 1.0
        For i As Integer = 2 To b.Length - 1
            Res1 *= (b(i) + x) ^ 2
        Next
        Res1 *= a
        For j As Integer = 5 To b.Length - 1
            Res2 *= (b(j) + x) ^ 2
        Next
        Res2 *= c ^ 2
        Return Res1 + Res2
    End Function
End Module

Sub Main()
Console.WriteLine(NoMame({1, 2, 3, 4, 5, 6, 7, 8}))
Console.Read()
End Sub

Module Module1
 
    Sub Main()
        Const x As Single = 0.25
        Const a As Single = 1.07
        Const c As Single = 0.2
 
        Dim Res_1 As Single = 0
        Dim Res_2 As Single = 0
        Dim b() As Single = {0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5} 'Заменить на Ваш массив
 
        For i As Integer = 2 To b.GetUpperBound(0)
            Res_1 = Math.Pow(b(i) + x, 2)
        Next
        Res_1 *= a
 
        For j As Integer = 5 To b.GetUpperBound(0)
            Res_2 = Math.Pow(b(j) + x, 2)
        Next
        Res_2 *= Math.Pow(c, 2)
 
        Console.WriteLine("Результат: " & (Res_1 + Res_2).ToString)
        Console.Read()
    End Sub
 
End Module