(1)2^(x+1)/2^(1-x)=2^[(x+1)-(x-1)]=2^2=4
(2) [(2a)^-1b^3]^2=b^6/(4a^2)
(3) 2^5/2 =2^(5-1)=2^4=16哥哥，你怎么算出来的啊