一、直接写出得数。（共28分）
$0.9 - 0.09 =$
$0.72 + 1.4 =$
$13.2 ÷ 2 =$
$2.5 × 0.79 × 4 =$
$0.3 ÷ 0.01 =$
$0.47 × 2 =$
$5 × 2.6 =$
$0.8 × 8 ÷ 2 =$
$4.6 + 4 =$
$55 ÷ 0.5 =$
$0.9 + 0.19 =$
$0.8 × 2 ÷ 0.1 =$
$0.42 ÷ 1.4 =$
$4.1 + 14.8 =$
$16.8 ÷ 20 =$
$3.6 ÷ 0.1 ÷ 0.4 =$
$\frac{4}{13} ÷ 5 =$
$0.875 + \frac{1}{8} =$
$\frac{1}{12} × \frac{6}{5} =$
$\frac{4}{5} × 4 ÷ 4 =$
$\frac{1}{4} ÷ 4 =$
$\frac{11}{5} ÷ 1.1 =$
$\frac{2}{3} × 12 =$
$\frac{1}{5} ÷ \frac{1}{5} × 10 ÷ \frac{1}{10} =$
$\frac{5}{7} - \frac{1}{2} =$
$\frac{4}{5} × \frac{7}{8} =$
$\frac{9}{10} ÷ \frac{3}{5} =$
$9 × \frac{1}{9} ÷ 9 × \frac{1}{9} =$

0.81
2.12
6.6
7.9
30
0.94
13
3.2
8.6
110
1.09
16
0.3
18.9
0.84
90
$\frac{4}{65}$
1
$\frac{1}{10}$
$\frac{4}{5}$
$\frac{1}{16}$
2
8
100
$\frac{3}{14}$
$\frac{7}{10}$
$\frac{3}{2}$
$\frac{1}{81}$

二、用竖式计算，带☆的要验算。（共20分）
8.03×0.14=
52.5÷0.25=
32.8÷2.3≈
（得数保留两位小数）
☆2.3×0.17=
52.95÷7.5=
☆3.91÷0.46=

1.1242
210
14.26
0.391
7.06
8.5
竖式及验算略

三、计算下面各题,能简算的要简算。(共24分)
$0.19×99 + 0.19$
$(\dfrac{8}{9} + \dfrac{2}{15} - \dfrac{2}{5}) ÷ \dfrac{1}{45}$
$7.81 - (3.81 - 1.65) + 2.25$
$\dfrac{14}{15}×125×\dfrac{15}{7}×8$
$\dfrac{5}{6}×[1 ÷ (\dfrac{7}{8} - \dfrac{3}{4})]$
$6.05×20.8 - 0.605×8$

19
28
7.9
2000
$\dfrac{20}{3}$
121