(1)5.2×39.8,
=5.2×(40-0.2),
=5.2×40-5.2×0.2,
=208-1.04,
=206.96;
(2)3.8×1.4+6,
=5.32+6,
=11.32;
(3)270.4÷(41-28.5)÷0.8,
=270.4÷12.5÷0.8,
=270.4÷(12.5×0.8),
=270.4÷10,
=27.04.
(1)5.2×39.8,
=5.2×(40-0.2),
=5.2×40-5.2×0.2,
=208-1.04,
=206.96;
(2)3.8×1.4+6,
=5.32+6,
=11.32;
(3)270.4÷(41-28.5)÷0.8,
=270.4÷12.5÷0.8,
=270.4÷(12.5×0.8),
=270.4÷10,
=27.04.