两边同时除以4^x得:
(3/2)^2x+1=2.5(3/2)^x
令t=(3/2)^x,得:t^2+1=2.5t
t^2-2.5t+1=0
(t-1/2)(t-2)=0
得:t=1/2 or 2
因此有:x=log1.5 (1/2) 或x=log1.5 (2)
两边同时除以4^x得:
(3/2)^2x+1=2.5(3/2)^x
令t=(3/2)^x,得:t^2+1=2.5t
t^2-2.5t+1=0
(t-1/2)(t-2)=0
得:t=1/2 or 2
因此有:x=log1.5 (1/2) 或x=log1.5 (2)