展开 1/((s+4)(s^2))

解答

展开

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

\frac{1}{s ^{3} + 4 s ^{2}}

求解步骤

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

去除括号:

(a) = a

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

乘开

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

= \frac{1}{s ^{3} + 4 s ^{2}}

e x p an d C (2, - 5) 4

e x p an d \frac{1}{( s + 20 ) ^{2}}

e x p an d 22 \frac{9 c}{5} + 32

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

e x p an d (e + d)^{2} - 18 (e + d) + 65