(1)2.72÷[(8.2-6.5)×0.5]=2.72÷[1.7×0.5],=2.72÷0.85,=3.2;(2)9.12+9.12×9-60.2=(1+9)×9.12-60.2,=10×9.12-60.2,=91.2-60.2,=31;(3)28.4÷0.4÷0.25=28.4÷(0.4×0.25),=28.4÷0.1,=284;(4)27.36-27.36÷7.6=27.6-3.6,=24.