8．简便计算．
36×（$\frac{7}{9}$+$\frac{5}{6}$）÷$\frac{29}{5}$
12.5×32×25%
4.25×0.75+75%+4.75×$\frac{3}{4}$．
36×（$\frac{7}{9}$+$\frac{5}{6}$）÷$\frac{29}{5}$
12.5×32×25%
4.25×0.75+75%+4.75×$\frac{3}{4}$．
7．直接写得数．
| 18.25-3.3= | 42π= | $\frac{1}{4}$×$\frac{1}{5}$÷$\frac{1}{4}$×$\frac{1}{5}$= | 6÷0.1%= |
| 1.25×3×8= | $\frac{5}{6}$×0÷$\frac{5}{6}$= | a-$\frac{2}{5}$a= | $\frac{3}{5}$-$\frac{4}{5}$+1= |
6．一件商品先提价10%，又降价10%后现价是99元，则原价是（ ）元．
| A． | 99 | B． | 100 | C． | 90 | D． | 110 |
5．一只挂钟的时针长6cm，一昼夜这根时针扫过的面积是（ ）cm2．
0 141650 141658 141664 141668 141674 141676 141680 141686 141688 141694 141700 141704 141706 141710 141716 141718 141724 141728 141730 141734 141736 141740 141742 141744 141745 141746 141748 141749 141750 141752 141754 141758 141760 141764 141766 141770 141776 141778 141784 141788 141790 141794 141800 141806 141808 141814 141818 141820 141826 141830 141836 141844 199269
| A． | 113.04 | B． | 18.84 | C． | 37.68 | D． | 226.08 |