设一条线段AB的长度为a,C点在靠近B点的黄金分割点上且AC为b AC/AB=BC/AC b^2=a×(a-b) b^2=a^2-ab a^2-ab+(1/4)b^2=(5/4)×b^2 (a-b/2)^2=(5/4)b^2 a-b/2=（√5/2）×b a-b/2=(√5)b/2 a=b/2+(√5)b/2 a=b(√5+1）/2 b/a=(√5-1）/2
黄金分割点怎么求?求几个例子,
设一条线段AB的长度为a,C点在靠近B点的黄金分割点上且AC为b AC/AB=BC/AC b^2=a×(a-b) b^2=a^2-ab a^2-ab+(1/4)b^2=(5/4)×b^2 (a-b/2)^2=(5/4)b^2 a-b/2=（√5/2）×b a-b/2=(√5)b/2 a=b/2+(√5)b/2 a=b(√5+1）/2 b/a=(√5-1）/2