$2^2 =$
$5^2 =$
$20^2 =$
$80^2 =$
$70^2 =$
$0.3^2 =$
$0.7^2 =$
$0.02^2 =$
$1.5^2 =$
$1.1^2 =$
$1.2^2 =$
$0.4^2 =$
$25^2 =$
$10^2 =$
$1.3^2 =$
$(\dfrac{1}{2})^2 =$
$(\dfrac{3}{4})^2 =$
$(\dfrac{4}{5})^2 =$
$(\dfrac{2}{3})^2 =$
$(\dfrac{7}{10})^2 =$
$(\dfrac{5}{6})^2 =$
$(\dfrac{3}{10})^2 =$
$(\dfrac{4}{9})^2 =$
$(\dfrac{5}{12})^2 =$
$(\dfrac{7}{11})^2 =$

1. 4 25 400 6400 4900 0.09 0.49 0.0004 2.25 1.21 1.44 0.16 625 100 1.69 $\frac{1}{4}$ $\frac{9}{16}$ $\frac{16}{25}$ $\frac{4}{9}$ $\frac{49}{100}$ $\frac{25}{36}$ $\frac{9}{100}$ $\frac{16}{81}$ $\frac{25}{144}$ $\frac{49}{121}$

2 图形计算（求下面各图形的面积）
建议用时2分钟 评价：☆☆☆
(1)
(2)
(3)

(1) $3.14×3^2=28.26(\mathrm{m}^2)$
(2) $3.14 × (1.2 ÷ 2)^2 = 1.1304(\mathrm{dm}^2)$
(3) $3.14 × (8 ÷ 2)^2 ÷ 2 = 25.12(\mathrm{cm}^2)$

3 脱式计算（能简算的要简算）
建议用时4分钟 评价：☆☆☆
$\frac{6}{17}×\frac{5}{9}+\frac{5}{9}×\frac{11}{17}$
$\frac{3}{8}×36×\frac{16}{27}$
$(\frac{1}{3}+\frac{3}{4}+\frac{5}{9})÷\frac{1}{36}$
$\frac{5}{14}÷\frac{4}{21}×\frac{16}{25}$
$\frac{3}{8}×(3-\frac{2}{3}-\frac{5}{3})$
$\frac{9}{8}÷[\frac{2}{5}+(\frac{7}{8}-\frac{2}{5})]$

1. $\frac{5}{9}$
2. 8
3. 59
4. $\frac{6}{5}$
5. $\frac{1}{4}$
6. $\frac{9}{7}$