展开 (k(s+2))/(s(s+20)(s-1))

解答

展开

\frac{k ( s + 2 )}{s ( s + 20 ) ( s - 1 )}

\frac{k s + 2 k}{s ^{3} + 19 s ^{2} - 20 s}

求解步骤

\frac{k ( s + 2 )}{s ( s + 20 ) ( s - 1 )}

乘开

s (s + 20) (s - 1) : s^{3} + 19 s^{2} - 20 s

= \frac{k ( s + 2 )}{s ^{3} + 19 s ^{2} - 20 s}

乘开

k (s + 2) : k s + 2 k

= \frac{k s + 2 k}{s ^{3} + 19 s ^{2} - 20 s}

e x p an d 2000 ((ln (3)) - 100 (ln (2)))

e x p an d x^{2} sin (ln (x)) (2 x cos (ln (x)) - x sin (ln (x)))

e x p an d (r - e)^{3} + (r - e)^{2}

e x p an d \frac{( 5 x ^{3} + 2 x ^{2} + 2 ) ln ( x )}{e ^{3 x} + x}

e x p an d \frac{14 b ^{7}}{7 b ^{5}}