①2.432÷3.2+0.24 =2.432÷（8×0.4）+0.24 =2.432÷8÷0.4+0.24 =0.304÷0.4+0.24 =0.76 ②13.2×5-10.9÷2 =66-5.45 =60.55 ③10.3+4.8-16.2÷2 =10.3+4.8-8.1 =15.1-8.1 =7
