9.计算
| $\frac{4}{15}$÷$\frac{8}{15}$ | 0.25×0.7×0.4 | 3.14×66+3.14×33+3.14 |
| 82×60%+0.6×118 | 65%x+12.5=25.5 | $\frac{7}{8}$x-0.75x=8. |
8.制作一个无盖的圆柱型铁桶,铁桶高和直径都是20厘米,那么需要铁皮( )平方厘米.
0 136564 136572 136578 136582 136588 136590 136594 136600 136602 136608 136614 136618 136620 136624 136630 136632 136638 136642 136644 136648 136650 136654 136656 136658 136659 136660 136662 136663 136664 136666 136668 136672 136674 136678 136680 136684 136690 136692 136698 136702 136704 136708 136714 136720 136722 136728 136732 136734 136740 136744 136750 136758 199269
| A. | 753.6 | B. | 439.6 | C. | 1570 |