(1)(1÷0.5+0.5÷1)×3.2,
=(2+0.5)×3.2,
=2.5×4×0.8,
=10×0.8,
=8;
(2)0.25×3.7×(3.8+0.2),
=0.25×4×3.7,
=1×3.7,
=3.7;
(3)52.8÷[18.2-(4.24÷0.8-0.3)],
=52.8÷[18.2-(5.3-0.3)],
=52.8÷[18.2-5],
=52.8÷13.2,
=4;
(4)0.375×8-0.8+7.25×0.8,
=0.8×(3.75-1+7.25),
=0.8×10,
=8.