第82页

信息发布者：
​$=(\frac {7}{15}+\frac {8}{15})-(\frac {5}{12}+\frac {7}{12})$​
​$=1-1$​
​$=0$​
​$=(\frac {11}{10}+\frac {13}{10})+(\frac {17}{6}-\frac {5}{6})$​
​$=\frac {12}{5}+2$​
​$=\frac {22}{5}$​
​$=5+(\frac {5}{8}-\frac {3}{8})$​
​$=5+\frac {1}{4}$​
​$=5 \frac {1}{4}$​
​$=(\frac {1}{4}-\frac {1}{4})+(\frac {1}{5}+\frac {1}{5})$​
​$=0+\frac {2}{5}$​
​$=\frac {2}{5}$​
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