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幼苗
共回答了19个问题采纳率:94.7% 举报
x^3-2x+1=0
x^3-x^2+(x^2-2x+1)=0
x^2*(x-1)+(x-1)^2=0
(x^2+x-1)(x-1)=0
(x+(1+√5)/2)(x+(1-√5)/2))(x-1)=0
S={1,-(1+√5)/2,(√5-1)/2}
所以S的所有子集为
空集、{1}、{-(1+√5)/2}、{(√5-1)/2}、{1,-(1+√5)/2}、{1,(√5-1)/2}、{-(1+√5)/2,(√5-1)/2}、{1,-(1+√5)/2,(√5-1)/2}
1年前
6