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第14页

信息发布者：

$\frac{2}{5}$

$\frac{2}{35}$

$\frac{1}{5}$

$1\frac{1}{3}$

$2\frac{1}{5}$

$\frac{13}{21}$

$\frac{2}{3}$

$\begin{aligned}解：x-\frac {19}{12}&=\frac {1}{2}\\x&=\frac {25}{12}\end{aligned}$

$\begin{aligned}解：x-\frac {1}{4}&=\frac {7}{12}\\x&=\frac {5}{6}\end{aligned}$

$=\frac {17}{10}-\frac {4}{15}$

$=\frac {43}{30}$

$=(\frac {3}{7}+\frac {4}{7})+(\frac {7}{13}-\frac {6}{13})$

$=1+\frac {1}{13}$

$=1 \frac {1}{13}$

$=9-(\frac {5}{12}+\frac {7}{12})$

$=9-1$

$=8$

$=(\frac {5}{8}-\frac {3}{8})+(\frac {1}{6}+\frac {5}{6})$

$=\frac {1}{4}+1$

$=\frac {5}{4}$

$\frac {5}{21}$

$\frac {35}{36}$

$\frac 23$

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