9.用递等式计算(能简便的用简便方法计算).
①2.3×1.5+4.5÷0.75 | ②$\frac{1}{6}$+$\frac{2}{7}$÷$\frac{3}{7}$ | ③$\frac{3}{5}$÷[$\frac{7}{11}$×($\frac{2}{5}$+$\frac{1}{3}$)] |
④0.7+3.8+4.2+9.3 | ⑤$\frac{3}{5}$×$\frac{1}{4}$+$\frac{3}{5}$×$\frac{3}{4}$ | ⑥(1+$\frac{1}{3}$)÷(1-$\frac{1}{3}$) |
8.直接写出下面各题的得数.
0 161558 161566 161572 161576 161582 161584 161588 161594 161596 161602 161608 161612 161614 161618 161624 161626 161632 161636 161638 161642 161644 161648 161650 161652 161653 161654 161656 161657 161658 161660 161662 161666 161668 161672 161674 161678 161684 161686 161692 161696 161698 161702 161708 161714 161716 161722 161726 161728 161734 161738 161744 161752 199269
4-0.9= | $\frac{1}{6}$×$\frac{6}{7}$= | 4÷0.8= | 0÷$\frac{4}{9}$= |
0.45×1000= | 9÷$\frac{1}{5}$= | 3.14×8= | $\frac{2}{5}$÷$\frac{1}{2}$= |
100×1%= | 25×0.7×4= | 2-2÷3= | ($\frac{3}{8}$-0.375)×5= |