(d^2)/(dx^2)(2x^3-x)

解答

\frac{d ^{2}}{d x ^{2}} (2 x^{3} - x)

12 x

求解步骤

\frac{d ^{2}}{d x ^{2}} (2 x^{3} - x)

\frac{d}{d x} (2 x^{3} - x) = 6 x^{2} - 1

= \frac{d}{d x} (6 x^{2} - 1)

\frac{d}{d x} (6 x^{2} - 1) = 12 x

= 12 x

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