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第34页

信息发布者：

$\frac{5}{7}$

$\frac{1}{2}$

$\frac{8}{5}$

$2.5a$

$\frac{4}{7}$

$\frac{1}{6}$

$\frac{7}{12}$

$\frac{3}{4}$

$\frac{11}{5}$

$\frac{4}{5}$

$ \begin {aligned}&=\frac {20}{30}+\frac {24}{30}-\frac {9}{30}\\&=\frac {35}{30}\\&=\frac {7}{6}\end {aligned}$

$ \begin {aligned}&=\frac {3}{8}×\frac {24}{35}×\frac {5}{6}\\&=\frac {9}{35}×\frac {5}{6}\\&=\frac {3}{14}\end {aligned}$

$ \begin {aligned}&=\frac {11}{8}-\frac {3}{8}-\frac {5}{6}-\frac {1}{6}\\&=(\frac {11}{8}-\frac {3}{8})-(\frac {5}{6}+\frac {1}{6})\\&=1-1\\&=0\end {aligned}$