1.6×8+8.8+4 =1.6×8+8×1.1+8×0.5 =8×(1.6+1.1+0.5) =8×3.2 =21.6 4.05÷8÷0.05 =4.05÷（8×0.05） =4.05÷0.4 =10.125
