1. 直接写出得数。
0.5×2.4=
$\frac{1}{3}+\frac{1}{4}=$
$\frac{3}{8}×4.8=$
$2-\frac{7}{9}=$
$\frac{2}{5}÷\frac{3}{10}=$
$\frac{4}{5}×\frac{5}{6}=$
0.3×0.3=
1.2÷0.5=
$\frac{3}{8}×\frac{5}{6}÷\frac{3}{8}=$

0.5×2.4=1.2
$\frac{1}{3}+\frac{1}{4}=\frac{7}{12}$
$\frac{3}{8}×4.8=1.8$
$2-\frac{7}{9}=\frac{11}{9}$
$\frac{2}{5}÷\frac{3}{10}=\frac{4}{3}$
$\frac{4}{5}×\frac{5}{6}=\frac{2}{3}$
0.3×0.3=0.09
1.2÷0.5=2.4
$\frac{3}{8}×\frac{5}{6}÷\frac{3}{8}=\frac{5}{6}$

2. 计算下面各题,怎样算简便就怎样算。
$\frac{5}{12} ÷ 8 + \frac{1}{8} × \frac{7}{12}$
$\frac{3}{10} × \frac{5}{3} + \frac{3}{10} ÷ 3$
$\frac{1}{3} ÷ (\frac{3}{5} - \frac{1}{3}) × \frac{3}{5}$
$\frac{3}{4} × 8 ÷ \frac{3}{4} × 8$
$(1 - 0.6) × 0.7 ÷ 0.4$
$(13.2 + 12) × 0.5 + 0.8$

$\frac{5}{12} ÷ 8 + \frac{1}{8} × \frac{7}{12}$
$=\frac{5}{12}×\frac{1}{8}+\frac{1}{8}×\frac{7}{12}$
$=\frac{1}{8}×(\frac{5}{12}+\frac{7}{12})$
$=\frac{1}{8}×1$
$=\frac{1}{8}$
$\frac{3}{10} × \frac{5}{3} + \frac{3}{10} ÷ 3$
$=\frac{3}{10}×\frac{5}{3}+\frac{3}{10}×\frac{1}{3}$
$=\frac{3}{10}×(\frac{5}{3}+\frac{1}{3})$
$=\frac{3}{10}×2$
$=\frac{3}{5}$
$\frac{1}{3} ÷ (\frac{3}{5} - \frac{1}{3}) × \frac{3}{5}$
$=\frac{1}{3}÷\frac{4}{15}×\frac{3}{5}$
$=\frac{1}{3}×\frac{15}{4}×\frac{3}{5}$
$=\frac{3}{4}$
$\frac{3}{4} × 8 ÷ \frac{3}{4} × 8$
$=\frac{3}{4}÷\frac{3}{4}×8×8$
$=1×64$
$=64$
$(1 - 0.6) × 0.7 ÷ 0.4$
$=0.4×0.7÷0.4$
$=0.4÷0.4×0.7$
$=1×0.7$
$=0.7$
$(13.2 + 12) × 0.5 + 0.8$
$=25.2×0.5+0.8$
$=12.6+0.8$
$=13.4$