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第64页

信息发布者：

$12÷130=\frac {6}{65}$

答：本纪的篇数是全书总篇数的$\frac {6}{65}。$

$70÷8=8\frac {3}{4} $

答：列传的篇数是书的篇数的$8\frac {3}{4}。$

答：乐乐填的对。$\frac {1}{6}=\frac {2}{12}，$$\frac {1}{7}=\frac {2}{14}，$因为$\frac {2}{14}＜\frac {2}{13}＜\frac {2}{12}，$所以$\frac {1}{7}＜\frac {2}{13}＜\frac {1}{6}。$

答：她的推测正确。$\frac {1}{a}=\frac {2}{2a}，$$\frac {1}{b}=\frac {2}{26}，$因为$a＞b＞0，$所以$2b＜a+b＜2a，$所以

$\frac {2}{2a}＜\frac {2}{a+b}＜\frac {2}{2b}，$也就是$\frac {1}{a}＜\frac {2}{a+b}＜\frac {1}{b}。$