1）口算
建议用时3分钟 评价：☆☆☆
$\frac{3}{4} ÷ \frac{2}{3} =$
$\frac{7}{6} × \frac{3}{14} =$
$\frac{2}{3} ÷ 12 =$
$\frac{3}{4} × \frac{1}{5} =$
$\frac{3}{7} × 1.4 =$
$\frac{2}{9} ÷ 2 =$
$\frac{3}{4} × 1.6 =$
$\frac{5}{17} ÷ \frac{15}{34} =$
$\frac{3}{5} × \frac{6}{5} =$
$5 ÷ \frac{15}{7} =$
$\frac{7}{10} ÷ 0.01 =$
$\frac{3}{7} × 4.2 =$
$\frac{13}{11} ÷ \frac{26}{3} =$
$\frac{5}{8} - \frac{13}{24} =$
$\frac{1}{12} ÷ \frac{7}{36} =$
$\frac{3}{4} - \frac{1}{2} × \frac{1}{2} =$

1. $\frac{9}{8}$ $\frac{1}{4}$ $\frac{1}{18}$ $\frac{3}{20}$ 0.6 $\frac{1}{9}$ 1.2 $\frac{2}{3}$ $\frac{18}{25}$ $\frac{7}{3}$ 70 1.8 $\frac{3}{22}$ $\frac{1}{12}$ $\frac{3}{7}$ $\frac{1}{2}$

2 填空（写出半径或直径）
建议用时2分钟 评价：☆☆☆
(1) $r=2\ \mathrm{cm}$
$d=\_\_\_\_\_\_$
(2) $d=6\ \mathrm{dm}$
$r=\_\_\_\_\_\_$
(3) $r=10\ \mathrm{m}$
$d=\_\_\_\_\_\_$
(4) $r=2.4\ \mathrm{cm}$
$d=\_\_\_\_\_\_$
(5) $d=3.6\ \mathrm{cm}$
$r=\_\_\_\_\_\_$
(6) $r=7.5\ \mathrm{cm}$
$d=\_\_\_\_\_\_$
(7) $r=5.6\ \mathrm{cm}$
$d=\_\_\_\_\_\_$
(8) $d=18.84\ \mathrm{cm}$
$r=\_\_\_\_\_\_$

2. (1) 4 cm (2) 3 dm (3) 20 m (4) 4.8 cm (5) 1.8 cm (6) 15 cm (7) 11.2 cm (8) 9.42 cm

$40×(\dfrac{3}{5}+\dfrac{3}{8})$
$7÷5×(\dfrac{5}{7}+\dfrac{5}{28})$
$4.2×19 -42×\dfrac{9}{10}$
$\dfrac{16}{25}×\dfrac{5}{14}÷\dfrac{4}{21}$
$5-\dfrac{14}{75}÷\dfrac{2}{15}-\dfrac{3}{5}$
$(\dfrac{11}{12}-\dfrac{3}{4}+\dfrac{1}{6})÷\dfrac{1}{24}$

3. 39 $1\dfrac{1}{4}$ 42 $\dfrac{6}{5}$ 3 8

如图，大长方形的左半部分是正方形，则大长方形的周长是（）cm。

4. 100