[log2(2)+log2(x)]*log2(x)=2///导入公式loga(b*c)=loga(b)+loga(c)
[1+log2(x)]*log2(x)=2
令log2(x)=t,则
(1+t)*t=2
t^2+t-2=0
t=1或t=-2
即log2(x)=1 x=2
或log2(x)=-2,x=2^(-2)=1/4