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

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。
$(156×\dfrac{4}{13}-26)×\dfrac{8}{11}$
$\dfrac{7}{8}×\dfrac{12}{13}+\dfrac{7}{3}÷13$
$\dfrac{8}{21}÷\dfrac{6}{5}×\dfrac{1}{4}×\dfrac{12}{5}$
$44÷[\dfrac{7}{6}+(\dfrac{3}{8}-\dfrac{1}{6})]$
$\dfrac{7}{22}÷\dfrac{8}{5}+\dfrac{3}{22}÷\dfrac{8}{7}$
$[0.8-(0.6-\dfrac{1}{2})]÷\dfrac{7}{8}$
$1.31×101$
$(8.14-3.74)÷2.5÷4$
$[3.06-(1.7-0.29)]×1.5$

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