1. 直接写出得数。
$7.45 - 0.3 =$
$0.46×2 =$
$9.6÷2 =$
$0.2×12.5×0.4 =$
$8.01×5 =$
$4.4 - 0.51 =$
$5.8×0.5 =$
$5.7÷1.9÷0.1 =$
$8.4 + 4 =$
$7.87 - 0.7 =$
$7.8÷0.4 =$
$0.9×0.6 + 0.4 =$
$3.4÷17 =$
$6.8÷0.4 =$
$11 - 6.9 =$
$(9.2 - 4.6)÷2.3 =$
$38÷0.19 =$
$1.6×0.5 =$
$17.4÷2 =$
$10.3 - 2.4 - 4.6 =$
$2.2 + 3.08 =$
$7÷0.35 =$
$0.35×3 =$
$4 - 5.6÷8 =$
$4.2÷0.6 =$
$7.4÷2 =$
$1.6×0.8 =$
$2.6 + (0.9 + 1.4) =$
$\frac{2}{3}×0.03 =$
$\frac{9}{28}÷\frac{11}{12} =$
$\frac{15}{28}÷\frac{2}{7} =$
$(\frac{9}{10} - \frac{2}{5})÷4 =$

7.15
0.92
4.8
1
40.05
3.89
2.9
30
12.4
7.17
19.5
0.94
0.2
17
4.1
2
200
0.8
8.7
3.3
5.28
20
1.05
3.3
7
3.7
1.28
4.9
0.02
$\frac{27}{77}$
$\frac{15}{8}$
$\frac{1}{8}$

2. 计算下面各题，怎样算简便就怎样算。
$7×(\dfrac{1}{7}×\dfrac{1}{8})×8$
$7×(\dfrac{1}{7}+\dfrac{1}{8})×8$
$0.5×[\dfrac{9}{5}-(\dfrac{4}{5}+\dfrac{6}{17})]$
$0.8×\dfrac{7}{24}×125×6$
$\dfrac{2}{3}×(\dfrac{3}{4}-\dfrac{1}{6})÷\dfrac{1}{5}$
$10.1×\dfrac{4}{5}-0.8×\dfrac{1}{10}$

1
15
$\frac{11}{34}$
175
$\frac{35}{18}$
8

看图填空。
(1)
大长方形的左边是正方形，
大长方形的周长是()厘米。
(2)
圆的直径是()厘米，
长方形的面积是()平方厘米。

(1) 100
(2) 20 1200