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第66页

信息发布者：

$\frac {2}{3}=\frac {6}{9}，$$\frac {5}{9}=\frac {5}{9}$

$\frac {2}{7}=\frac {16}{56}，$$\frac {3}{8}=\frac {21}{56}$

$\frac {7}{12}=\frac {14}{24}，$$\frac {7}{8}=\frac {21}{24}$

$\frac 78=\frac {63}{72}，$$\frac 79=\frac {56}{72}$

答：大于$ \frac 79$小于$\frac 78$的分数有$\frac {57}{72}、$$\frac {59}{72}、$$\frac {61}{72}。$