1. 直接写出得数。
实际用时：分钟
$\frac{2}{7}+\frac{2}{35}=$
$\frac{2}{5}-\frac{2}{15}=$
$\frac{4}{9}×18=$
$\frac{2}{7}÷\frac{1}{2}=$
$\frac{1}{10}+\frac{4}{15}=$
$\frac{2}{5}-\frac{1}{7}=$
$\frac{3}{5}×\frac{25}{8}=$
$\frac{7}{30}÷\frac{2}{15}=$
$\frac{3}{14}+\frac{4}{7}=$
$\frac{7}{8}-\frac{2}{5}=$
$\frac{4}{5}×\frac{2}{7}=$
$14÷\frac{7}{5}=$
$\frac{7}{11}+\frac{1}{7}=$
$\frac{5}{14}-\frac{5}{28}=$
$77×\frac{5}{11}=$
$\frac{3}{20}÷\frac{1}{5}=$
$\frac{1}{3}+\frac{4}{15}=$
$\frac{9}{10}-\frac{1}{5}=$
$\frac{1}{9}×2.7=$
$\frac{1}{4}÷\frac{1}{9}=$
$0.18+\frac{3}{5}=$
$1-\frac{13}{40}=$
$\frac{9}{25}×5=$
$12÷\frac{3}{11}=$

1. $\frac{12}{35}\quad \frac{4}{15}\quad 8\quad \frac{4}{7}$
$\frac{11}{30}\quad \frac{9}{35}\quad \frac{15}{8}\quad \frac{7}{4}$
$\frac{11}{14}\quad \frac{19}{40}\quad \frac{8}{35}\quad 10$
$\frac{60}{77}\quad \frac{5}{28}\quad 35\quad \frac{3}{4}$
$\frac{3}{5}\quad \frac{7}{10}\quad \frac{9}{10}\quad \frac{9}{4}$
$\frac{39}{50}\quad \frac{27}{40}\quad \frac{9}{5}\quad 44$

2. 计算下面各题。
$\frac{7}{11}÷9+\frac{1}{9}×\frac{4}{11}$
$(\frac{3}{8}+\frac{5}{27})×2+\frac{17}{27}$
$14÷\frac{1}{6}+8÷\frac{1}{12}+28÷\frac{2}{5}$

2. $\frac{1}{9}\quad \frac{7}{4}\quad 250$

3. 将下面各比按比值从小到大的顺序排一排。
450:350　　5:$\frac{4}{7}$　　1.2:$\frac{3}{10}$　　$\frac{7}{10}$:0.35　　$\frac{9}{4}$:$\frac{3}{16}$
()＜()＜()＜()＜()

3. $450:350\quad \frac{7}{10}:0.35\quad 1.2:\frac{3}{10}\quad 5:\frac{4}{7}\quad \frac{9}{4}:\frac{3}{16}$

计算：$(\frac{1}{5}+\frac{1}{7}+\frac{1}{9}+\frac{1}{11})×(\frac{1}{7}+\frac{1}{9}+\frac{1}{11}+\frac{1}{13})-(\frac{1}{5}+\frac{1}{7}+\frac{1}{9}+\frac{1}{11}+\frac{1}{13})×(\frac{1}{7}+\frac{1}{9}+\frac{1}{11})$

$\frac{1}{65}$