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黄金比值(用p表示)由方程x2+x-1= O的根确定: 现在我们将方程稍作改动为1/x=1-x/x, 构造相似三角形(如图1),为方便起见,我们构造等腰三角形．
The gold ratio (represented by p) is determined by the root of the equation x2+x-1= O: Now we will make a slight change to the equation 1/x=1-x/x, constructing a similar triangle (Figure 1), for convenience We construct isosceles triangles.