三次根号x-1=x-1
x-1=(x-1)³
（x-1）³-（x-1）=0
(x-1)(x²+x+1)-(x-1)=0
(x-1)(x²+x+1-1)=0
x(x-1)(x+1)=0
x1=0 x2=1 x3=-1
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