1.直接写出得数。（每题1★）
$\frac{1}{7}×\frac{4}{5}=$
$\frac{2}{5}×\frac{1}{5}=$
$\frac{1}{4}×\frac{1}{6}=$
$\frac{2}{11}×\frac{2}{3}=$
$\frac{4}{5}×\frac{4}{5}=$
$\frac{3}{7}×\frac{1}{2}=$
$\frac{1}{2}×\frac{1}{5}=$
$\frac{1}{7}×\frac{5}{6}=$
$\frac{8}{19}×\frac{5}{8}=$
$\frac{3}{7}×\frac{5}{6}=$
$\frac{2}{13}×\frac{1}{2}=$
$\frac{6}{7}×\frac{7}{13}=$
$\frac{4}{5}×\frac{3}{8}=$
$\frac{2}{3}×\frac{9}{10}=$
$\frac{5}{14}×\frac{7}{15}=$
$\frac{5}{7}×\frac{14}{15}=$
$\frac{13}{22}×\frac{11}{39}=$
$\frac{5}{21}×\frac{7}{25}=$
$\frac{5}{9}×\frac{21}{20}=$
$\frac{17}{50}×\frac{15}{17}=$

1.$\frac{4}{35}$ $\frac{2}{25}$ $\frac{1}{24}$ $\frac{4}{33}$
$\frac{16}{25}$ $\frac{3}{14}$ $\frac{1}{10}$ $\frac{5}{42}$
$\frac{5}{19}$ $\frac{5}{14}$ $\frac{1}{13}$ $\frac{6}{13}$
$\frac{3}{10}$ $\frac{3}{5}$ $\frac{1}{6}$ $\frac{2}{3}$
$\frac{1}{6}$ $\frac{1}{15}$ $\frac{7}{12}$ $\frac{3}{10}$

识别出错

2.$\frac{19}{20}$ $\frac{4}{9}$ $\frac{10}{11}$
$\frac{17}{24}$ 27.28 0

3.解方程。（每题3★）
$\frac{11}{12}+x=\frac{7}{3}$
$x-\frac{5}{6}=\frac{2}{15}$
$\frac{5}{6}-x=\frac{4}{5}$

3.$x=\frac{17}{12}$ $x=\frac{29}{30}$ $x=\frac{1}{30}$