x³-1/x³= 1-1/x³
x-1/x= 1-1/x=3
1/x=-2
1/x³=-8
1-(-8)=9
х^3-(1/х^3) =( x-(1/x))(x^2+x×(1/x)+(1/x^2) )=( x-(1/x))(x^2+1+(1/x^2) )=
=( x-(1/x) )(x^2-2+(1/x^2) +3)=
=( x-(1/x) )((x-(1/x))^2+3)=
=3×(3^2+3)=3×12=36.
x³-1/x³= 1-1/x³
x-1/x= 1-1/x=3
1/x=-2
1/x³=-8
1-(-8)=9
х^3-(1/х^3) =( x-(1/x))(x^2+x×(1/x)+(1/x^2) )=( x-(1/x))(x^2+1+(1/x^2) )=
=( x-(1/x) )(x^2-2+(1/x^2) +3)=
=( x-(1/x) )((x-(1/x))^2+3)=
=3×(3^2+3)=3×12=36.