(1)3.045+2.7×6.9,
=3.045+18.63,
=21.675;
(2)18.94-2.5×4,
=18.94-10,
=8.94;
(3)3.65×2.8+3.65×7.2,
=3.65×(2.8+7.2),
=3.65×10,
=36.5;
(4)13.54×102-2×13.54,
=13.54×(102-2),
=13.45×100,
=1345.
(1)3.045+2.7×6.9,
=3.045+18.63,
=21.675;
(2)18.94-2.5×4,
=18.94-10,
=8.94;
(3)3.65×2.8+3.65×7.2,
=3.65×(2.8+7.2),
=3.65×10,
=36.5;
(4)13.54×102-2×13.54,
=13.54×(102-2),
=13.45×100,
=1345.