Question

31+

1

2

log37=

3

7

．

Answer 1

分析：利用對(duì)數(shù)的和等于乘積的對(duì)數(shù)化簡(jiǎn)指數(shù)，然后利用對(duì)數(shù)的運(yùn)算性質(zhì)得答案．

解答：解：31+

1

2

log37=3log33+log3

7

=3log33

7

=3

7

．
故答案為3

7

．

點(diǎn)評(píng)：本題考查了對(duì)數(shù)的運(yùn)算性質(zhì)，關(guān)鍵是熟記有關(guān)性質(zhì)，是基礎(chǔ)題．