(1)2,f(a1),f(a2),...,f(an),2n+4成等差数列令n=1,则2,f(a1),6为等差数列f(a1)=(2+6)/2=4则公差d=2所以f(an)的通项公式为f(an)=2n+2所以an的通项公式为an=a^(2n+2)(a>0且a不为1)(2)an=a^(2n+2)为等比数列,q=a^2,a1=a...