(1)[0.5+(2-0.75)]×1.6
=[0.5+1.25]×1.6
=1.75×1.6
=2.8
(2)10.73-4.76-5.24
=10.73-(4.76+5.24)
=10.73-10
=0.73
(3)17.4×2.43-1.43×7.4
=(10+7.4)×2.43-1.43×7.4
=10×2.43+7.4×2.43-1.43×7.4
=24.3+7.4×(2.43-1.43)
=24.3+7.4
=31.7
(4)2.2+(4.72-2.8)÷0.4
=2.2+1.92÷0.4
=2.2+4.8
=7