(b/a)^2-(b/a)- 1=0,b/a=( 1√5)/2。
(1). When b/a=( 1+√5)/2, a/b = 2/(1+√ 5) = (√ 5-1)/2.
(b^2)/(a^2)-(a^2)/(b^2)=√5.
(1). When b/a=( 1-√5)/2, a/b = 2/(1-√ 5) =-(√ 5+1)/2.
(b^2)/(a^2)-(a^2)/(b^2)=-√5.