一、根据比例的基本性质，在括号里填合适的数。
$\frac{1}{2}:\frac{1}{4}=(\ ):\frac{7}{8}$
$3.6:4=(\ ):8$
$(\ ):12=\frac{7}{4}:2.8$
$\frac{1}{3}:(\ )=\frac{1}{12}:\frac{2}{9}$
$2.6:(\ )=13:5$
$(\ ):\frac{1}{2}=8:9$
$\frac{1}{4}:(\ )=\frac{1}{3}:\frac{8}{9}$
$\frac{1}{9}:\frac{5}{4}=(\ ):5$
$4.6:0.23=(\ ):0.5$
$0.24:0.5=(\ ):5$
$\frac{3}{4}:(\ )=6:16$
$\frac{1}{5}:\frac{1}{6}=\frac{1}{15}:(\ )$
$20:(\ )=\frac{2}{3}:\frac{4}{5}$
$18:3.6=25:(\ )$
$3.2:0.7=(\ ):8.4$

1.$\frac{7}{4}$
2.$7.2$
3.$\frac{15}{2}$
4.$\frac{8}{9}$
5.$1$
6.$\frac{4}{9}$
7.$\frac{2}{3}$
8.$\frac{4}{9}$
9.$10$
10.$2.4$
11.$2$
12.$\frac{1}{18}$
13.$24$
14.$5$
15.$38.4$

二、计算下面各题，能简算的要简算。
$(156×\frac{4}{13} -26)×\frac{8}{11}$
$\frac{7}{8}×\frac{12}{13} + \frac{7}{3}÷13$
$\frac{8}{21}÷\frac{6}{5}×\frac{1}{4}×\frac{12}{5}$
$44÷[\frac{7}{6} + (\frac{3}{8} - \frac{1}{6})]$
$\frac{7}{22}÷\frac{8}{5} + \frac{3}{22}÷\frac{8}{7}$
$[0.8 - (0.6 - \frac{1}{2})]÷\frac{7}{8}$
$1.31×101$
$(8.14 - 3.74)÷2.5÷4$
$[3.06 - (1.7 - 0.29)]×1.5$

1.$16$
2.$\frac{77}{78}$
3.$\frac{4}{21}$
4.$32$
5.$\frac{7}{22}$
6.$\frac{4}{5}$
7.$132.31$
8.$0.44$
9.$2.475$