Вот программа:
uses Crt;
var i: integer;
begin
ClrScr;
for i:=65 to 90 do
Write(Chr(i):4);
WriteLn; WriteLn;
for i:=97 to 122 do
Write(Chr(i):4);
WriteLn;
ReadLn;
end.
Var a, b, x : real;
Begin
Write('Введите а: ');
Readln(a);
Write('Введите b: ');
Readln(b);
X := -b + b * b - 4 * a * b / 2 * a;
Write('x = ', x : 0 : 2);
Readln;
End.