(1)728-155-328,
=728-328-155,
=400-155,
=245;
(2)621-321÷3,
=621-107,
=514;
(3)463+342+158,
=463+(342+158),
=463+500,
=963;
(4)873-322+278,
=551+278,
=829;
(5)1234-773-327,
=1234-(773+327),
=1234-1100,
=134;
(6)111×9+111,
=111×(9+1),
=111×10,
=1110.