[NumLock]

да уж куда проще:

Код:

var
  ScriptControl: IScriptControl;
begin
  ScriptControl:=CreateComObject(CLASS_ScriptControl) as IScriptControl;
  ScriptControl.Language:='javascript';
  Memo1.Lines.Add(ScriptControl.Eval('(2*5+90+Math.abs(-900))/10'));
end;