展开 k/(s(s+2))

解答

展开

\frac{k}{s ( s + 2 )}

\frac{k}{s ^{2} + 2 s}

求解步骤

\frac{k}{s ( s + 2 )}

乘开

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

= \frac{k}{s ^{2} + 2 s}

e x p an d zy (z = e^{x + y} + e^{x - y})

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

e x p an d \frac{20 ( x ^{2} - 6 )}{x ^{5}}

e x p an d \frac{cos ( z )}{z ^{2} \cdot ( z ^{2} + 1 )}

s im pl i f y - 8 (\frac{y}{4} - \frac{y ^{2}}{2})