一、在括号里填合适的数。　　
$4:3 = 8:($　　$) ) 1.2:8 = 3.6:($　　$) ) ($　　$) ) : 6 = 14:30.8:0.5 = ($　　$) ) : 4 1.5:3 = ($　　$) ) : 9 0.2:0.1 = ($　　$) ) : 4$　　
$2:($　　$) ) = 6:3.6 1:($　　$) ) = 3:1.5 4.8:($　　$) ) = 1.2:2.4\frac{1}{3}:\frac{1}{5} = \frac{1}{6}:($　　$) ) ($　　$) ) : \frac{3}{8} = 5:3 \frac{4}{5}:\frac{4}{15} = \frac{5}{8}:($　　$) )$　　
$0.25:($　　$) ) = \frac{5}{2}:30 ($　　$) ) : \frac{10}{7} = 35:10 2:5 = \frac{2}{9}:($　　$) )\frac{4}{5}:2 = 8:($　　$) ) \frac{3}{20}:\frac{3}{2} = ($　　$) ) : 90 \frac{1}{20}:($　　$) ) = 1:4$　　

一、6 24 28
6.4 4.5 8
1.2 0.5 9.6
$\frac{1}{10} \frac{5}{8} \frac{5}{24}$
$3 5 \frac{5}{9}$
$20 9 \frac{1}{5}$

二、解比例。
$8:3.2 = 1.25:x$ $\frac{9}{8} = 13.5:x$ $x:4 = \frac{4}{5}:8$
$\frac{1}{6}:\frac{1}{20} = \frac{16}{9}:x$ $\frac{4}{3}:\frac{8}{25} = x:\frac{4}{25}$ $2.7:x = 5:\frac{5}{4}$
$\frac{x}{30} = \frac{15}{18}$ $\frac{18}{5}:\frac{3}{5} = x:\frac{1}{3}$ $0.24:0.4 = x:5$
$x:84 = \frac{5}{7}:10$ $x:\frac{1}{2} = 12:\frac{3}{5}$ $3:4 = \frac{1}{20}:x$
$70\%:\frac{2}{7} = x:20$ $10:x = \frac{2}{3}:\frac{4}{5}$ $x:2.4 = 15:0.8$
$\frac{x}{3} = \frac{0.6}{4}$ $\frac{5}{12}:x = 2:9$ $\frac{1}{3}:x = \frac{7}{5}:\frac{9}{5}$
$x:\frac{3}{4} = 16:36$ $\frac{5}{2}:x = \frac{1}{20}:\frac{1}{5}$ $2.5:0.9 = 30:x$
$x:8 = \frac{3}{4}:\frac{1}{5}$ $x:1.2 = 3:4$ $\frac{3}{2}:\frac{1}{5} = \frac{3}{4}:x$

二、$x=0.5 x=12 x=\frac{2}{5}$
$x=\frac{8}{15} x=\frac{2}{3} x=\frac{27}{40}$
x=25 x=2 x=3