AC两城间有两条公路．一辆汽车从A城出发经B城到C城用了6小时．
15．脱式计算，能简算的要简算
| 70.8-1.25-1.75 | 5.81+8.3+4.19+11.7 | 3.54×0.29-0.29×2.54 |
| 12.8+2.04×4.5 | 7.2×9.9 | 48×0.69+3.1×4.8 |
| 3.2×1.4+5.62 | 51.8-4.8×（2.03-0.18） | 0.25×17.3×0.4 |
| 6.15×8.4-42 | 10-1.8×1.2 | 4.87×2.34+48.7×0.266 |
| 0.05×0.7×20×1.7 | 2.5×3.2×12.5 | 3.95×7.6+3.95×3.4-3.95 |
13．直接写得数．
0 159595 159603 159609 159613 159619 159621 159625 159631 159633 159639 159645 159649 159651 159655 159661 159663 159669 159673 159675 159679 159681 159685 159687 159689 159690 159691 159693 159694 159695 159697 159699 159703 159705 159709 159711 159715 159721 159723 159729 159733 159735 159739 159745 159751 159753 159759 159763 159765 159771 159775 159781 159789 199269
| 420÷5= | 13×25×4= | 23÷32= | 0.9÷1%= |
| $\frac{2}{3}$×12= | $\frac{9}{2}$÷$\frac{5}{6}$= | $\frac{5}{6}$天-2时= | 2.5÷$\frac{5}{6}$= |
如图是小红上学的路线图，