对数方程log2(x-1)=log4 x,如何化成(x-1)²=x
问题描述:
对数方程log2(x-1)=log4 x,如何化成(x-1)²=x
答
log2(x-1)=log4 x,
则 x>1
log2(x-1)=log2 √x
x-1=√x
(x-1)²=x