设长度AC=x米 则BC=x+2，AB=2x+2黄金分割比例为0.618即(x+2)/(2x+2)=0.618解得x+2=1.236x+1.2360.236x=0.764x=0.180304
设 BC为X AC为Y X=Y+2 X/Y=1.618 算X Y应该简单吧
