x*1=(1-x)^2 展开：x=1-2x+x^2 移项：x^2-3x+1=0
x*1=(1-x)^2x=1-2x+x^2x^2-2x+1-x=0x^2-3x+1=0(x-3/2)^2=5/4x=3/2±√5/2
