竞赛题（9）方程x^
方程x^-/x/-1=0的解是？
x^2-/x/-1=0 |x|^2-|x|-1=0 (|x|-1/2)^2=3/4 |x|-1/2=√3/2或|x|-1/2=√3/2 |x|=√3/2-1/2或|x|=√3/2+1/2 x=√3/2-1/2或x=√3/2+1/2或x=-√3/2+1/2或x=-√3/2-1/2