展开 1/(s(1+2s+3*s^2+1.5s^3))

解答

展开

\frac{1}{s \cdot ( 1 + 2 \cdot s + 3 \cdot s ^{2} + 1.5 s ^{3} )}

\frac{1}{s + 2 s ^{2} + 3 s ^{3} + 1.5 s ^{4}}

求解步骤

\frac{1}{s ( 1 + 2 s + 3 s ^{2} + 1.5 s ^{3} )}

乘开

s (1 + 2 s + 3 s^{2} + 1.5 s^{3}) : s + 2 s^{2} + 3 s^{3} + 1.5 s^{4}

= \frac{1}{s + 2 s ^{2} + 3 s ^{3} + 1.5 s ^{4}}

e x p an d y d x - 2 (x - y) d y

e x p an d (6 cot (θ) + 5)^{2}

e x p an d 4 (72 x^{7} ln (x) + 17 x^{7}) x^{2}

e x p an d (- 7 d^{2} + 4 e - 6 f^{3}) (d^{2} + 3 e + 3 f^{3})

e x p an d - 4 (5 - x = - 16)