(x-6)(x²+x+1)-x(2x+1)(3x-1)
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(x-6)(x²+x+1)-x(2x+1)(3x-1)(x-6)(x²+x+1)-x(2x+1)(3x-1)(x-6)(x²+x+1)-x(2x+1)(3x-1)-5*x
(x-6)(x²+x+1)-x(2x+1)(3x-1)
(x-6)(x²+x+1)-x(2x+1)(3x-1)
(x-6)(x²+x+1)-x(2x+1)(3x-1)
-5*x^3-6*x^2-4*x-6
(x-6)(x^2十x十1)-x(2x十1)(3x-1)
=x(x^2十x十1)-6(x^2十x 1)-6x^3-x^2-x
=x^3十x^2十x-6x^2-6x-6-6x^3-x^2-x
=-5x^3-6x^2-6x-6