设x-1=y
x-x-1分之3-1=0化为：
y-3/y=0
y²-3=0
y²=3
y=±√3
x-1=±√3
x=1±√3题目是 x- x-1分之3 -1=0是啊：x-( x-1)分之3 -1=0(x-1) -(x-1)分之3 =0y-3/y=0y²-3=0y²=3y=±√3x-1=±√3x=1±√3