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
答
log2 (x-1)
(x-1)^2而由题设有:x-1>0,2-x>0,即1