[Andrevv]

Если db - приращение величины b, то текст следующий:

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  b,db,log,z:real;
  k:integer;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
b:=-2.5;
db:=0.3;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
k:=0;
log:=1E30;
while log>0.045 do
begin
log:=2/(b*b+b+2);
z:=b*b*b+ln(log);
memo1.Lines.Add('z = '+floattostr(z));
k:=k+1;
b:=b+db;
end;
memo1.Lines.Add('b = '+floattostr(b));
memo1.Lines.Add('k = '+floattostr(k));
end;
end.