????????????? ?–?? + ? ??????????? ?–?? ????????????? ???? ???? ???? ???? ??????????????????? ?—? ???????????? ????????????? ?–? + ? ??????????????????????? ?. ???????????????????????????????????????????? ? ?????? ???? ?????? ????? ????????? ????????????.???????? ??? ??????????????????????????????? ???? ??? (? + -? ?) ?? (? + ?-? + ?) ?? (?