展开 (6s+9)/((2(s+1)(s-1)(s+2)))

解答

展开

\frac{6 s + 9}{( 2 ( s + 1 ) ( s - 1 ) ( s + 2 ) )}

\frac{6 s + 9}{2 s ^{3} + 4 s ^{2} - 2 s - 4}

求解步骤

\frac{6 s + 9}{2 ( s + 1 ) ( s - 1 ) ( s + 2 )}

乘开

2 (s + 1) (s - 1) (s + 2) : 2 s^{3} + 4 s^{2} - 2 s - 4

= \frac{6 s + 9}{2 s ^{3} + 4 s ^{2} - 2 s - 4}

e x p an d \frac{- \frac{16}{5}}{t + 3} - \frac{\frac{11}{5}}{t - 2}

e x p an d 8 (e^{\frac{x ^{2} - 7}{7}} - 3)

e x p an d \frac{2 x ^{3} + x ^{2} + 2 x - 1}{( x ^{2} + 1 ) ( x + 1 ) ( x - 1 )}

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

e x p an d \frac{3 ^{n} + ( - 2 ) ^{n}}{1 7 ^{n}}