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第82頁

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?$=(\frac {7}{15}+\frac {8}{15})-(\frac {5}{12}+\frac {7}{12})$?
?$=1-1$?
?$=0$?
?$=(\frac {11}{10}+\frac {13}{10})+(\frac {17}{6}-\frac {5}{6})$?
?$=\frac {12}{5}+2$?
?$=\frac {22}{5}$?
?$=5+(\frac {5}{8}-\frac {3}{8})$?
?$=5+\frac {1}{4}$?
?$=5 \frac {1}{4}$?
?$=(\frac {1}{4}-\frac {1}{4})+(\frac {1}{5}+\frac {1}{5})$?
?$=0+\frac {2}{5}$?
?$=\frac {2}{5}$?
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