一、口算。
$\frac {22}{9}×\frac {3}{11}=$
$\frac {5}{12}+\frac {2}{3}=$
$\frac {4}{7}×\frac {1}{12}=$
$\frac {2}{7}×4=$
$\frac {3}{5}×\frac {7}{15}=$
$\frac {2}{3}×\frac {2}{3}=$
$\frac {3}{5}+\frac {12}{5}=$
$5-\frac {3}{7}=$
$\frac {7}{24}×\frac {3}{14}=$
$\frac {5}{6}×\frac {1}{5}=$
$\frac {6}{7}×\frac {5}{9}=$
$0.625×\frac {7}{5}=$
$\frac {4}{7}×\frac {1}{8}=$
$\frac {2}{3}+\frac {7}{12}=$
$\frac {4}{11}×22=$
$\frac {2}{3}×\frac {6}{7}=$
$\frac {4}{5}+\frac {1}{10}=$
$\frac {4}{9}×\frac {1}{3}=$
$\frac {3}{8}×\frac {2}{3}=$
$\frac {5}{6}×\frac {9}{25}=$
$\frac {2}{3}-\frac {1}{6}=$

$\frac{2}{3}$ $\frac{13}{12}$ $\frac{1}{21}$ $\frac{8}{7}$ $\frac{7}{25}$ $\frac{4}{9}$ 3 $4\frac{4}{7}$ $\frac{1}{16}$ $\frac{1}{6}$ $\frac{10}{21}$ $\frac{7}{8}$ $\frac{1}{14}$ $\frac{5}{4}$ 8 $\frac{4}{7}$ $\frac{9}{10}$ $\frac{4}{27}$ $\frac{1}{4}$ $\frac{3}{10}$ $\frac{1}{2}$

$\frac{22}{9}×\frac{3}{11}=\frac{2}{3}$
$\frac{5}{12}+\frac{2}{3}=\frac{13}{12}$
$\frac{4}{7}×\frac{1}{12}=\frac{1}{21}$
$\frac{2}{7}×4=\frac{8}{7}$
$\frac{3}{5}×\frac{7}{15}=\frac{7}{25}$
$\frac{2}{3}×\frac{2}{3}=\frac{4}{9}$
$\frac{3}{5}+\frac{12}{5}=3$
$5 - \frac{3}{7}=4\frac{4}{7}$
$\frac{7}{24}×\frac{3}{14}=\frac{1}{16}$
$\frac{5}{6}×\frac{1}{5}=\frac{1}{6}$
$\frac{6}{7}×\frac{5}{9}=\frac{10}{21}$
$0.625×\frac{7}{5}=\frac{7}{8}$
$\frac{4}{7}×\frac{1}{8}=\frac{1}{14}$
$\frac{2}{3}+\frac{7}{12}=\frac{5}{4}$
$\frac{4}{11}×22=8$
$\frac{2}{3}×\frac{6}{7}=\frac{4}{7}$
$\frac{4}{5}+\frac{1}{10}=\frac{9}{10}$
$\frac{4}{9}×\frac{1}{3}=\frac{4}{27}$
$\frac{3}{8}×\frac{2}{3}=\frac{1}{4}$
$\frac{5}{6}×\frac{9}{25}=\frac{3}{10}$
$\frac{2}{3}-\frac{1}{6}=\frac{1}{2}$

二、计算下面各题。
$33×\frac {6}{11}×\frac {2}{3}$
$\frac {8}{9}×\frac {3}{4}×\frac {3}{14}$
$\frac {4}{15}×60×\frac {5}{8}$
$\frac {4}{5}×\frac {7}{8}×\frac {3}{14}$
$\frac {1}{23}×\frac {5}{9}×23$
$\frac {7}{18}×\frac {12}{25}×\frac {5}{14}$

12 $\frac{1}{7}$ 10 $\frac{3}{20}$ $\frac{5}{9}$ $\frac{1}{15}$

$33×\frac {6}{11}×\frac {2}{3}$
$=3×6×\frac{2}{3}$
$=6×2$
$=12$
$\frac {8}{9}×\frac {3}{4}×\frac {3}{14}$
$=\frac{2}{3}×\frac{3}{14}$
$=\frac{2}{14}$
$=\frac{1}{7}$
$\frac {4}{15}×60×\frac {5}{8}$
$=16×\frac{5}{8}$
$=2×5$
$=10$
$\frac {4}{5}×\frac {7}{8}×\frac {3}{14}$
$=\frac{7}{10}×\frac{3}{14}$
$=\frac{3}{20}$
$\frac {1}{23}×\frac {5}{9}×23$
$=\frac{1}{23}×23×\frac{5}{9}$
$=1×\frac{5}{9}$
$=\frac{5}{9}$
$\frac {7}{18}×\frac {12}{25}×\frac {5}{14}$
$=\frac{7}{18}×\frac{12×5}{25×14}$
$=\frac{7}{18}×\frac{60}{350}$
$=\frac{7}{18}×\frac{6}{35}$
$=\frac{1}{15}$