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第82页

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$=(\frac {7}{15}+\frac {8}{15})-(\frac {5}{12}+\frac {7}{12})$

$=1-1$

$=0$

$=(\frac {11}{10}+\frac {13}{10})+(\frac {17}{6}-\frac {5}{6})$

$=\frac {12}{5}+2$

$=\frac {22}{5}$

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

$=5+\frac {1}{4}$

$=5 \frac {1}{4}$

$=(\frac {1}{4}-\frac {1}{4})+(\frac {1}{5}+\frac {1}{5})$

$=0+\frac {2}{5}$

$=\frac {2}{5}$