展开 (x(1-9x)(3x+2))/(2(3x+1)(3x-1)(x+7))

解答

展开

\frac{x ( 1 - 9 x ) ( 3 x + 2 )}{2 ( 3 x + 1 ) ( 3 x - 1 ) ( x + 7 )}

\frac{- 27 x ^{3} - 15 x ^{2} + 2 x}{18 x ^{3} + 126 x ^{2} - 2 x - 14}

求解步骤

\frac{x ( 1 - 9 x ) ( 3 x + 2 )}{2 ( 3 x + 1 ) ( 3 x - 1 ) ( x + 7 )}

乘开

2 (3 x + 1) (3 x - 1) (x + 7) : 18 x^{3} + 126 x^{2} - 2 x - 14

= \frac{x ( - 9 x + 1 ) ( 3 x + 2 )}{18 x ^{3} + 126 x ^{2} - 2 x - 14}

乘开

x (1 - 9 x) (3 x + 2) : - 27 x^{3} - 15 x^{2} + 2 x

= \frac{- 27 x ^{3} - 15 x ^{2} + 2 x}{18 x ^{3} + 126 x ^{2} - 2 x - 14}

e x p an d 6 (\frac{6}{12} + \frac{8}{12} + \frac{9}{12})

e x p an d cos (2) (t - \frac{π}{2})

e x p an d (A e^{t} - B e^{- t})^{2}

e x p an d A (5, - 5) Y B (8, 3)

e x p an d \frac{12 ( lo g _{2} ( 3 x - 2 ) ) ^{3}}{ln ( 2 ) ( 3 x - 2 )}