一、口算。
$\frac {5}{28}÷\frac {1}{7}=$
$1-\frac {4}{5}=$
$\frac {3}{4}÷\frac {9}{8}=$
$\frac {15}{4}×\frac {2}{5}=$
$\frac {3}{8}×\frac {3}{8}=$
$\frac {5}{9}÷\frac {5}{6}=$
$30÷\frac {5}{6}=$
$\frac {5}{12}+\frac {1}{9}=$
$\frac {2}{3}×\frac {5}{4}=$
$\frac {6}{7}×\frac {7}{9}=$
$15×\frac {4}{5}=$
$\frac {1}{4}÷\frac {1}{2}=$
$\frac {11}{12}÷22=$
$\frac {5}{9}÷\frac {5}{12}=$
$\frac {3}{10}×\frac {5}{6}=$
$\frac {3}{4}+\frac {1}{2}=$
$\frac {9}{10}÷\frac {3}{5}=$
$\frac {1}{4}÷\frac {2}{3}=$
$\frac {2}{5}+\frac {5}{6}=$
$\frac {3}{4}-\frac {2}{3}=$
$\frac {4}{9}×\frac {6}{11}=$

一、$\frac{5}{4}$ $\frac{1}{5}$ $\frac{2}{3}$ $\frac{3}{2}$ $\frac{9}{64}$ $\frac{2}{3}$ 36 $\frac{19}{36}$ $\frac{5}{6}$ $\frac{2}{3}$ 12 $\frac{1}{2}$ $\frac{1}{24}$ $\frac{4}{3}$ $\frac{1}{4}$ $\frac{5}{4}$ $\frac{3}{2}$ $\frac{3}{8}$ $\frac{37}{30}$ $\frac{1}{12}$ $\frac{8}{33}$

二、解方程。
$\frac {1}{4}+\frac {3}{4}x= 2$
$\frac {1}{4}×\frac {6}{7}+x= \frac {11}{14}$
$\frac {4}{5}x-\frac {2}{5}= \frac {9}{10}$
$\frac {2}{7}x×\frac {1}{4}= \frac {3}{5}$
$x+\frac {2}{9}x= 22$
$(\frac {1}{4}+x)×2= \frac {4}{3}$

二、$x=\frac{7}{3}$ $x=\frac{4}{7}$ $x=\frac{13}{8}$ $x=\frac{42}{5}$ $x=18$ $x=\frac{5}{12}$

解：$\frac{1}{4}+\frac{3}{4}x=2$
$\frac{3}{4}x=2-\frac{1}{4}$
$\frac{3}{4}x=\frac{7}{4}$
$x=\frac{7}{3}$
解：$\frac{1}{4}×\frac{6}{7}+x=\frac{11}{14}$
$\frac{3}{14}+x=\frac{11}{14}$
$x=\frac{11}{14}-\frac{3}{14}$
$x=\frac{4}{7}$
解：$\frac{4}{5}x-\frac{2}{5}=\frac{9}{10}$
$\frac{4}{5}x=\frac{9}{10}+\frac{2}{5}$
$\frac{4}{5}x=\frac{13}{10}$
$x=\frac{13}{8}$
解：$\frac{2}{7}x×\frac{1}{4}=\frac{3}{5}$
$\frac{1}{14}x=\frac{3}{5}$
$x=\frac{42}{5}$
解：$x+\frac{2}{9}x=22$
$\frac{11}{9}x=22$
$x=18$
解：$(\frac{1}{4}+x)×2=\frac{4}{3}$
$\frac{1}{4}+x=\frac{2}{3}$
$x=\frac{2}{3}-\frac{1}{4}$
$x=\frac{5}{12}$