Question

16．根據(jù)規(guī)律，填一填：
（1）$\frac{1}{15}$、$\frac{1}{5}$、$\frac{3}{5}$、$\frac{9}{5}$、$\frac{27}{5}$、$\frac{81}{5}$．
（2）$\frac{1}{4}$、$\frac{3}{8}$、$\frac{5}{16}$、$\frac{7}{32}$、$\frac{9}{64}$．

Answer 1

分析 （1）后一個數(shù)是前一個數(shù)的3倍，據(jù)此解答即可；
（2）分數(shù)的分子依次加2，分母后一個是前一個的2倍，據(jù)此解答即可．

解答 解：（1）$\frac{9}{5}$×3=$\frac{27}{5}$
$\frac{27}{5}$×3=$\frac{81}{5}$
（2）$\frac{7}{32}$，$\frac{9}{64}$．
故答案為：$\frac{27}{5}$，$\frac{81}{5}$，$\frac{7}{32}$，$\frac{9}{64}$．

點評 解答此題的關(guān)鍵是根據(jù)所給出的數(shù)列，找出規(guī)律，再根據(jù)規(guī)律解決問題．