展开-(18x)/((x^2-9)^2)

解答

展开

- \frac{18 x}{( x ^{2} - 9 ) ^{2}}

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

求解步骤

- \frac{18 x}{( x ^{2} - 9 ) ^{2}}

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

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

e x p an d cos (x) (1 + tan (2 x))

e x p an d \frac{( 1 - x ) ^{2}}{2}

e x p an d (x + 3)^{4}

e x p an d (x - \frac{2}{x})^{5}

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