(1)x=log(7)(1/3)=lg(1/3)/lg7=-lg3/lg7.(2)x=log(8)(7)=lg7/lg8=lg7/(3lg2).= = = = = = =很不幸的告诉你,lg2,lg3,lg7是要查表,或者用计算器的.类似这样的对数题目,一般都会给出lg2,lg3,lg5等质数的常用对数.主要考...