展开 (3+9x)/((1+x)(3+5x))

解答

展开

\frac{3 + 9 x}{( 1 + x ) ( 3 + 5 x )}

\frac{3 + 9 x}{3 + 8 x + 5 x ^{2}}

求解步骤

\frac{3 + 9 x}{( 1 + x ) ( 3 + 5 x )}

乘开

(1 + x) (3 + 5 x) : 3 + 8 x + 5 x^{2}

= \frac{3 + 9 x}{3 + 8 x + 5 x ^{2}}

e x p an d (x - 2 - i) (x - 2 + i)

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

e x p an d 1 + \frac{( e ^{x} - e ^{- x} ) ^{2}}{4}

\frac{d}{d y} ((x) (x - y))

e x p an d (t e^{t} + t e^{2 t})^{2}