展开-(6x)/((x^2+9)^2)

解答

展开

- \frac{6 x}{( x ^{2} + 9 ) ^{2}}

- \frac{6 x}{x ^{4} + 18 x ^{2} + 81}

求解步骤

- \frac{6 x}{( x ^{2} + 9 ) ^{2}}

(x^{2} + 9)^{2} = x^{4} + 18 x^{2} + 81

= - \frac{6 x}{x ^{4} + 18 x ^{2} + 81}

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