一、口算。
$\frac {7}{24}÷35=$
$\frac {1}{2}×\frac {3}{5}=$
$\frac {13}{16}÷\frac {5}{4}=$
$4-\frac {8}{3}=$
$\frac {4}{5}÷\frac {3}{10}=$
$\frac {10}{3}+\frac {8}{5}=$
$\frac {2}{3}÷\frac {5}{12}=$
$\frac {4}{5}×\frac {3}{8}=$
$12÷\frac {3}{10}=$
$40×\frac {2}{5}=$
$\frac {9}{10}÷\frac {1}{5}=$
$\frac {7}{24}×\frac {3}{4}=$
$\frac {7}{5}÷\frac {21}{10}=$
$\frac {3}{20}+\frac {1}{4}=$
$\frac {1}{24}÷\frac {1}{12}=$
$\frac {5}{9}×\frac {3}{5}=$
$\frac {3}{4}÷\frac {3}{2}=$
$\frac {1}{5}-\frac {1}{6}=$
$\frac {1}{2}-\frac {3}{14}=$
$7÷\frac {7}{15}=$
$\frac {9}{5}×\frac {5}{6}=$

一、$\frac{1}{120}$ $\frac{3}{10}$ $\frac{13}{20}$ $\frac{4}{3}$ $\frac{8}{3}$ $\frac{74}{15}$ $\frac{8}{5}$ $\frac{3}{10}$ $40$ $16$ $\frac{9}{2}$ $\frac{7}{32}$ $\frac{2}{3}$ $\frac{2}{5}$ $\frac{1}{2}$ $\frac{1}{3}$ $\frac{1}{2}$ $\frac{1}{30}$ $\frac{2}{7}$ $15$ $\frac{3}{2}$

二、计算下面各题。
$\frac {2}{3}×\frac {1}{3}×\frac {4}{7}$
$\frac {1}{6}×\frac {2}{13}÷\frac {3}{26}$
$\frac {8}{7}÷\frac {16}{27}÷\frac {6}{7}$
$\frac {45}{77}×\frac {11}{5}÷\frac {27}{14}$
$\frac {36}{35}÷\frac {24}{5}×\frac {7}{3}$
$\frac {5}{14}÷\frac {15}{4}×\frac {7}{10}$

二、$\frac{8}{63}$ $\frac{2}{9}$ $\frac{9}{4}$ $\frac{2}{3}$ $\frac{1}{2}$ $\frac{1}{15}$

$\frac{2}{3}×\frac{1}{3}×\frac{4}{7}=\frac{2×1×4}{3×3×7}=\frac{8}{63}$
$\frac{1}{6}×\frac{2}{13}÷\frac{3}{26}=\frac{1}{6}×\frac{2}{13}×\frac{26}{3}=\frac{1×2×26}{6×13×3}=\frac{4}{18}=\frac{2}{9}$
$\frac{8}{7}÷\frac{16}{27}÷\frac{6}{7}=\frac{8}{7}×\frac{27}{16}×\frac{7}{6}=\frac{8×27×7}{7×16×6}=\frac{27}{12}=\frac{9}{4}$
$\frac{45}{77}×\frac{11}{5}÷\frac{27}{14}=\frac{45}{77}×\frac{11}{5}×\frac{14}{27}=\frac{45×11×14}{77×5×27}=\frac{2}{3}$
$\frac{36}{35}÷\frac{24}{5}×\frac{7}{3}=\frac{36}{35}×\frac{5}{24}×\frac{7}{3}=\frac{36×5×7}{35×24×3}=\frac{1}{2}$
$\frac{5}{14}÷\frac{15}{4}×\frac{7}{10}=\frac{5}{14}×\frac{4}{15}×\frac{7}{10}=\frac{5×4×7}{14×15×10}=\frac{1}{15}$