Question

已知a＞1,a^lgb=,則lg(ab)的最小值是(    )

A.1             B.log₂10             C.log₂10             D.

Answer 1

解析：由a^lgb=得lga·lgb=lg2.

又∵lga·lgb≤,

∴(lgab)²≥lg2.

答案：D