(1)17.17-6.8-3.2-6.17 =(17.17-6.17)-(6.8+3.2), =11-10, =1; (2)5.4×[(1.3+2.15)÷0.2] =5.4×[3.45÷0.2], =5.4×17.25, =93.15; (3)8.4÷0.6+8.4÷0.4 =14+21 =35; (4)16.8×10.1 =16.8×10+16.8×0.1, =168+1.68, =169.68; (5)10.9-0.9÷0.2+1.8 =10.9-4.5+1.8, =8.2; (6)1.25×3.2×0.25 =(1.25×0.8)×(4×0.25), =1×1, =1. |