(1)3.8+5.6÷0.7×4, =3.8+8×4, =3.8+32, =35.8; (2)[7.6-(1.8+0.28)]×1.5, =(7.6-2.08)×1.5, =9.68×1.5, =14.52; (3)520-13.5×6, =520-81, =439.