1. 直接写出得数。
$10 - 0.7 =$
$0.36 ÷ 3 =$
$0.12 ÷ 0.2 =$
$7.2 + 2.8 ÷ 0.1 =$
$1.8 × 5 =$
$1.5 × 0.3 =$
$2.1 ÷ 0.03 =$
$6.1 × 99 + 6.1 =$
$8.4 ÷ 0.4 =$
$2.3 × 0.02 =$
$70 × 0.07 =$
$(4.5 + 6.3) ÷ 0.2 =$
$8 ÷ 0.5 =$
$9.8 - 0.98 =$
$1.03 + 0.7 =$
$5.5 ÷ 0.5 - 1.8 =$
$\frac{4}{9} + \frac{2}{3} =$
$\frac{3}{4} ÷ \frac{9}{5} =$
$\frac{9}{5} - \frac{11}{15} =$
$\frac{5}{7} - \frac{5}{7} ÷ 5 =$
$\frac{3}{11} × 0 =$
$\frac{5}{4} ÷ 3 =$
$6.5 ÷ \frac{1}{2} =$
$\frac{4}{19} + 5 × \frac{2}{5} =$
$\frac{7}{8} × 12 =$
$\frac{5}{18} ÷ \frac{5}{36} =$
$4.5 × \frac{2}{5} =$
$\frac{4}{9} + \frac{5}{9} ÷ 0.1 =$
$\frac{5}{6} ÷ \frac{5}{6} =$
$\frac{25}{26} ÷ 125 =$
$\frac{1}{12} ÷ \frac{5}{4} =$
$3 × \frac{1}{4} + \frac{3}{4} =$

1. 9.3 0.12 0.6 35.2
9 0.45 70 610
21 0.046 4.9 54
16 8.82 1.73 9.2
$\frac{10}{9}$ $\frac{5}{12}$ $\frac{16}{15}$ $\frac{4}{7}$
0 $\frac{5}{12}$ 13 $2\frac{4}{19}$
$\frac{21}{2}$ 2 1.8 6
1 $\frac{1}{130}$ $\frac{1}{15}$ $\frac{3}{2}$

2. 计算下面各题,怎样算简便就怎样算。
$3.8 + 0.42 × 3.5$
$\frac{4}{5} × (4.8 - 2.4) ÷ 0.15$
$0.96 ÷ [ \frac{1}{3} × (6 - 2.8) ]$
$5.6 × ( \frac{4}{7} + \frac{5}{8} - \frac{3}{4} )$
$\frac{2}{5} + \frac{8}{9} ÷ \frac{5}{9} + 0.375$
$\frac{3}{20} ÷ [ \frac{1}{2} × ( \frac{4}{7} + \frac{5}{7} ) ]$

2. 5.27 12.8 0.9
2.5 2.375 $\frac{7}{30}$

如果☆+○=100，那么10×☆×0.0081+○×0.081=()；
如果☆×○=10，那么(☆×4.5×0.1)×○=()。

8.1 4.5