Question

="________."

Answer 1

試題分析：因為根據(jù)同底數(shù)的對數(shù)的運算法則，可知所求的表達式可以得到為

故答案為
點評：解決該試題的關鍵是能理解對數(shù)的運算性質：乘積的對數(shù)等于對數(shù)的和，商的對數(shù)等于對數(shù)的差，冪的對數(shù)等于冪指數(shù)倍的對數(shù)值，化簡得到。