在括号里填合适的数。
$4:3 = 8:(\quad)$ $1.2:8 = 3.6:(\quad)$ $(\quad):6 = 14:3$
$0.8:0.5 = (\quad):4$ $1.5:3 = (\quad):9$ $0.2:0.1 = (\quad):4$
$2:(\quad)=6:3.6$ $1:(\quad)=3:1.5$ $4.8:(\quad)=1.2:2.4$
$\frac{1}{3}:\frac{1}{5}=\frac{1}{6}:(\quad)$ $(\quad):\frac{3}{8}=5:3$ $\frac{4}{5}:\frac{4}{15}=\frac{5}{8}:(\quad)$
$0.25:(\quad)=2.5:30$ $(\quad):\frac{10}{7}=35:10$ $2:5=\frac{2}{9}:(\quad)$
$\frac{4}{5}:2 = 8:(\quad)$ $\frac{3}{20}:\frac{3}{2}=(\quad):90$ $\frac{1}{20}:(\quad)=1:4$

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 $\frac{1}{5}$

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

$x = 0.5$ $x = 12$ $x = \frac{2}{5}$
$x = \frac{8}{15}$ $x = \frac{2}{3}$ $x = \frac{27}{40}$
$x = 25$ $x = 2$ $x = 3$
$x = 6$ $x = 10$ $x = \frac{1}{15}$
$x = 49$ $x = 12$ $x = 45$
$x = 0.45$ $x = \frac{15}{8}$ $x = \frac{3}{7}$
$x = \frac{1}{3}$ $x = 10$ $x = 10.8$
$x = 30$ $x = 0.9$ $x = \frac{1}{10}$