log2^(X-1) + log2^(x-2) -1 = 0
问题描述：
log2^(X-1) + log2^(x-2) -1 = 0
是一元三项的对数函数方程,为了防止看错,我加了空格.
答
log2^(X-1) + log2^(x-2) -1 = 0
log2^[(x-1)(x-2)]=1
(x-1)(x-2)=2^1=2
x^2-3x+2=2
x^2-3x=0
(x)(x-3)=0
x=0 x=3楼上说0要舍去究竟要不要？要舍去对数的真数要大于0