展开 1+((k*(s^2-2s+2)))/(s(s+1)(s+2))

解答

展开

1 + \frac{( k \cdot ( s ^{2} - 2 s + 2 ) )}{s ( s + 1 ) ( s + 2 )}

1 + \frac{k s ^{2} - 2 k s + 2 k}{s ^{3} + 3 s ^{2} + 2 s}

求解步骤

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

\frac{k ( s ^{2} - 2 s + 2 )}{s ( s + 1 ) ( s + 2 )} = \frac{k s ^{2} - 2 k s + 2 k}{s ^{3} + 3 s ^{2} + 2 s}

= 1 + \frac{k s ^{2} - 2 k s + 2 k}{s ^{3} + 3 s ^{2} + 2 s}

s im pl i f y - (\frac{9}{13} lo g_{2} (\frac{9}{13}) + \frac{4}{13} lo g_{2} (\frac{4}{13}))

e x p an d ln (20) (e^{\frac{x}{52}} - 1)

e x p an d 2 t^{4} e^{- 2 t} + [U^{4} (t) (t - 3)]

e x p an d sin ((4 n + 3) \cdot 9 0^{\circ})

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