一、口算。
$0.2×45=$
$1287+978=$
$2.4×4÷0.6=$
$78÷20=$
$2.4×0.4=$
$1.25×0×8=$
$45.5-12.25=$
$640÷32=$
$99×0.37+0.37=$
$9.25+9.25=$
$4.55÷5=$
$(1.2+0.7)×0.1=$
$10.87-2.7=$
$0.4×2.9=$
$3.89-0.09-0.8=$
$\frac{18}{19}÷\frac{3}{4}=$
$\frac{7}{9}÷\frac{11}{5}=$
$\frac{7}{8}-\frac{5}{12}+\frac{1}{8}=$
$\frac{2}{5}×\frac{1}{6}=$
$\frac{3}{8}÷\frac{1}{2}=$
$(\frac{3}{4}-\frac{7}{12})×24=$
$0.5+\frac{7}{10}=$
$\frac{7}{6}+\frac{2}{5}=$
$(1-\frac{1}{4})÷\frac{1}{4}=$

1.9
2.2265
3.16
4.3.9
5.0.96
6.0
7.33.25
8.20
9.37
10.18.5
11.0.91
12.0.19
13.8.17
14.1.16
15.3
16.$\frac{24}{19}$
17.$\frac{35}{99}$
18.$\frac{7}{12}$
19.$\frac{1}{15}$
20.$\frac{3}{4}$
21.4
22.$\frac{6}{5}$
23.$\frac{47}{30}$
24.3

二、计算下面各题，能简算的要简算。
$\frac{7}{8}÷\frac{3}{8}-\frac{1}{8}÷\frac{3}{8}$
$\frac{9}{5}÷(\frac{3}{5}-\frac{1}{25}×\frac{3}{2})$
$7÷(\frac{3}{5}-0.25)×\frac{4}{5}$
$26.48÷0.25÷40$
$(3.75+5.1+1.25)×9.8$
$12.75÷[14.6-(1.1+8.4)]$

1.2
2.$\frac{10}{3}$
3.16
4.2.648
5.98.98
6.2.5