1. 直接写出得数。
实际用时：分钟
$8÷\frac{4}{3}=$ $\frac{5}{6}÷\frac{5}{7}=$ $\frac{3}{8}÷\frac{3}{5}=$ $\frac{3}{4}÷\frac{3}{11}=$
$\frac{7}{12}÷\frac{7}{24}=$ $\frac{3}{5}÷\frac{8}{9}=$ $\frac{4}{9}÷\frac{5}{12}=$ $\frac{5}{7}÷\frac{4}{9}=$
$\frac{3}{4}+\frac{1}{5}=$ $\frac{7}{8}-\frac{5}{24}=$ $\frac{7}{12}×\frac{4}{5}=$ $\frac{7}{8}÷\frac{5}{24}=$
$\frac{4}{9}×18=$ $\frac{7}{10}×\frac{2}{7}=$ $9×\frac{5}{18}=$ $\frac{16}{21}×\frac{7}{8}=$
$\frac{4}{5}×15=$ $\frac{13}{14}×\frac{28}{39}=$ $45×\frac{3}{5}=$ $\frac{7}{18}×27=$
$\frac{3}{40}+\frac{1}{8}=$ $\frac{7}{8}-\frac{3}{32}=$ $\frac{5}{24}×\frac{8}{15}=$ $\frac{1}{13}÷\frac{1}{26}=$

1. $6\quad \frac{7}{6}\quad \frac{5}{8}\quad \frac{11}{4}$
$2\quad \frac{27}{40}\quad \frac{16}{15}\quad \frac{45}{28}$
$\frac{19}{20}\quad \frac{2}{3}\quad \frac{7}{15}\quad \frac{21}{5}$
$8\quad \frac{1}{5}\quad \frac{5}{2}\quad \frac{2}{3}$
$12\quad \frac{2}{3}\quad 27\quad \frac{21}{2}$
$\frac{1}{5}\quad \frac{25}{32}\quad \frac{1}{9}\quad 2$

2. 计算下面各题。
$\frac{7}{12}×85 -7÷12$
$\frac{4}{5}×(\frac{5}{6}+\frac{3}{4})-\frac{4}{15}$
$\frac{3}{11}÷[\frac{2}{5}+(1-\frac{10}{11})]$

2. $49\quad 1\quad \frac{5}{9}$

3. 把比值相等的两个比连起来。

计算：$(1+\frac{1}{2}+\frac{1}{3}+\dots+\frac{1}{2026})×(\frac{1}{2}+\frac{1}{3}+\dots+\frac{1}{2027})-(1+\frac{1}{2}+\frac{1}{3}+\dots+\frac{1}{2027})×(\frac{1}{2}+\frac{1}{3}+\dots+\frac{1}{2026})$

$\frac{1}{2027}$