识别出错

1. $20$ $\frac{3}{4}$ $\frac{1}{9}$ $\frac{1}{12}$
$0$ $\frac{3}{5}$ $64$ $\frac{7}{15}$
$1$ $25$ $\frac{1}{28}$ $0$
$\frac{5}{3}$ $\frac{5}{14}$ $\frac{1}{2}$ $1$
$\frac{1}{6}$ $\frac{2}{25}$ $\frac{11}{12}$ $\frac{1}{6}$

2.计算下面各题,能简算的要简算。(每题 3★)
$\frac{35}{36} ÷ \frac{5}{6}$
$\frac{35}{39} ÷ \frac{14}{13}$
$\frac{15}{16} × \frac{56}{25}$
$\frac{1}{4} + \frac{5}{7} - \frac{3}{28}$
$\frac{5}{12} - (\frac{1}{4} - \frac{1}{12})$
$\frac{23}{24} - \frac{5}{7} + \frac{1}{24} - \frac{2}{7}$

2. $\frac{7}{6}$ $\frac{5}{6}$ $\frac{21}{10}$
$\frac{6}{7}$ $\frac{1}{4}$ $0$

3.解方程。（每题3★）
$\frac{3}{4}x=\frac{1}{9}$
$x÷\frac{8}{9}=\frac{3}{16}$
$\frac{4}{5}x - 3.4=4.6$

3. $x=\frac{4}{27}$ $x=\frac{1}{6}$ $x=10$