4k^3+6k^2+k+1=0.求K~

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4k^3+6k^2+k+1=0.求K~4k^3+6k^2+k+1=0.求K~4k^3+6k^2+k+1=0.求K~ans=-1/12*(324+12*633^(1/2))^(1/3)-2/(324+1

4k^3+6k^2+k+1=0.求K~
4k^3+6k^2+k+1=0.求K~

4k^3+6k^2+k+1=0.求K~
ans =
-1/12*(324+12*633^(1/2))^(1/3)-2/(324+12*633^(1/2))^(1/3)-1/2;
1/24*(324+12*633^(1/2))^(1/3)+1/(324+12*633^(1/2))^(1/3)-1/2+1/2*i*3^(1/2)*(-1/12*(324+12*633^(1/2))^(1/3)+2/(324+12*633^(1/2))^(1/3));
1/24*(324+12*633^(1/2))^(1/3)+1/(324+12*633^(1/2))^(1/3)-1/2-1/2*i*3^(1/2)*(-1/12*(324+12*633^(1/2))^(1/3)+2/(324+12*633^(1/2))^(1/3));