(1)1.6×55.4-55.4×0.6-55.4,=(1.6-0.6-1)×55.4,=0×55.4,=0;(2)17.68÷5.2+2.7×1.5,=3.4+4.05,=7.45;(3)4.8×0.25,=(1.2×4)×0.25,=1.2×(4×0.25),=1.2×1,=1.2.