展开 ((16)/((s^2-16)(s^2+4)))+(1/(s(s^2+4)))

解答

展开

(\frac{16}{( s ^{2} - 16 ) ( s ^{2} + 4 )}) + (\frac{1}{s ( s ^{2} + 4 )})

\frac{16}{s ^{4} - 12 s ^{2} - 64} + \frac{1}{s ^{3} + 4 s}

求解步骤

(\frac{16}{( s ^{2} - 16 ) ( s ^{2} + 4 )}) + (\frac{1}{s ( s ^{2} + 4 )})

去除括号:

(a) = a

= \frac{16}{( s ^{2} - 16 ) ( s ^{2} + 4 )} + \frac{1}{s ( s ^{2} + 4 )}

乘开

(s^{2} - 16) (s^{2} + 4) : s^{4} - 12 s^{2} - 64

= \frac{16}{s ^{4} - 12 s ^{2} - 64} + \frac{1}{s ( s ^{2} + 4 )}

乘开

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

= \frac{16}{s ^{4} - 12 s ^{2} - 64} + \frac{1}{s ^{3} + 4 s}

e x p an d (f x)^{3} - 1

e x p an d \frac{4 ( x + h - 3 )}{h}

\frac{d}{d y} ((x) (x^{4} y^{3} + 8 x^{2} y))

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

e x p an d \frac{x}{( x - 1 ) ( x - 0.7 + 0.9 j ) ( z - 0.7 - 0.9 j )}