1. 直接写出得数。
$7÷\frac{7}{5}=$
$8÷\frac{16}{25}=$
$\frac{5}{18}÷\frac{5}{18}=$
$\frac{8}{9}÷\frac{10}{27}=$
$\frac{6}{7}÷\frac{3}{4}=$
$\frac{8}{21}÷\frac{5}{7}=$
$\frac{4}{39}÷\frac{4}{13}=$
$\frac{8}{27}÷\frac{2}{9}=$
$\frac{2}{3}÷\frac{5}{12}=$
$\frac{1}{2}×\frac{1}{3}=$
$\frac{1}{4}×\frac{1}{5}÷\frac{1}{4}×\frac{1}{5}=$
$\frac{3}{11}×(\frac{5}{7}-\frac{5}{7})=$

1. $5$ $\frac{25}{2}$ $1$ $\frac{12}{5}$ $\frac{8}{7}$ $\frac{8}{15}$ $\frac{1}{3}$ $\frac{4}{3}$ $\frac{8}{5}$ $\frac{1}{6}$ $\frac{1}{25}$ $0$

2. 解方程。
$x+\dfrac{1}{4}x=20$
$\dfrac{2}{3}x÷\dfrac{1}{4}=12$
$\dfrac{2}{5}x-\dfrac{1}{3}x=\dfrac{3}{10}$

2. $x=16$ $x=\frac{9}{2}$ $x=\frac{9}{2}$

3. 递等式计算。
$\frac{3}{5}×\frac{6}{7}÷\frac{3}{8}$
$\frac{11}{12}÷2.2×\frac{4}{5}$
$(\frac{1}{3}+\frac{11}{12}-\frac{3}{4})÷\frac{1}{24}$
$\frac{4}{13}÷\frac{8}{7}+\frac{9}{13}×0.875$
$\frac{2}{7}-(\frac{2}{7}-\frac{2}{5})$
$(\frac{7}{12}+\frac{7}{9})×\frac{3}{7}$

3. $\frac{48}{35}$ $\frac{1}{3}$ $12$ $\frac{7}{8}$ $\frac{2}{5}$ $\frac{7}{12}$