在横线里填“>”“<”或“=”.
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(1)27+19×8,
=27+152,
=179;
(27+19)×8,
=46×8,
=368;
179<368,
所以,27+19×8<(27+19)×8.
(2)83-47-28,
=36-28,
=8;
83-(47-28),
=83-19,
=64;
8<64,
所以,83-47-28<83-(47-28).
(3)450÷3×2,
=150×2,
=300;
450÷(3×2),
=450÷6,
=75;
300>75,
所以,450÷3×2>450÷(3×2).
(4)66×31×54,
=2046×54,
=110484;
31×(54×66),
=31×3564,
=110484.
110484=110484,
所以,66×31×54=31×(54×66).
故答案为:<,<,>,=.