解 x^2-1/3x-1=0
x^2-1/3x+(1/36)-1-(1/36)=0
(x-1/6)^2=37/36
x-1/6=±√37/6
x=(1±√37)/6
列方程式 x^2-1/3x-1=0
x^2-1/3x+(1/36)-1-(1/36)=0
x-1/6=土√37/6
x1=1/6+√37/6
x2=1/6-√37/6
x^2-1/3x-1=0
x^2-1/3*x=1
(x-1/6)^2=37/36
x-1/6=土√37/6
x1=1/6+√37/6 x2=1/6-√37/6 .