log2(x-1)扫码下载作业帮拍照答疑一拍即得

问题描述:

log2(x-1)

扫码下载作业帮
拍照答疑一拍即得

log2 (x-1)log2 (x-1)2log2 (x-1)log2 (x-1)^2log2 (x-1)^2由于y=log2 x是个增函数,故:
(x-1)^2而由题设有:x-1>0,2-x>0,即1综上所述:1