Найдите значение выражения:
(9x^2-3xb+b^2)(3x+b)-9x(3x^2-b)-b^3=27x^3+b^3-9x*(3x^2-b)-b^3=27x^3+b^3-(27x^2-9b)*x-b^3=27x^3+b^3-(27x^3-9bx)-b^3=27x^3+b^3-27x^3+9bx-b^3=b^3+9bx-b^3=9bx9bx=9*2/3*(-1/3)=-6*(1/3)=-2
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Answers & Comments
(9x^2-3xb+b^2)(3x+b)-9x(3x^2-b)-b^3=27x^3+b^3-9x*(3x^2-b)-b^3=27x^3+b^3-(27x^2-9b)*x-b^3=27x^3+b^3-(27x^3-9bx)-b^3=27x^3+b^3-27x^3+9bx-b^3=b^3+9bx-b^3=9bx
9bx=9*2/3*(-1/3)=-6*(1/3)=-2