Question

函数y=log₂(x++5)(x＞1)的最小值为（    ）

A.-3             B.3              C.4               D.-4

Answer 1

思路解析：x＞1x-1＞0,y=log₂(x++5)=log₂(x-1++6)≥log₂(2+6)=log₂8=3.

答案：B