展开 ((3b-3)3)/(2b^9)

解答

展开

\frac{( 3 b - 3 ) 3}{2 b ^{9}}

\frac{9}{2 b ^{8}} - \frac{9}{2 b ^{9}}

求解步骤

\frac{( 3 b - 3 ) \cdot 3}{2 b ^{9}}

乘开

(3 b - 3) \cdot 3 : 9 b - 9

= \frac{9 b - 9}{2 b ^{9}}

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{9 b - 9}{2 b ^{9}} = \frac{9 b}{2 b ^{9}} - \frac{9}{2 b ^{9}}

= \frac{9 b}{2 b ^{9}} - \frac{9}{2 b ^{9}}

消掉

\frac{9 b}{2 b ^{9}} : \frac{9}{2 b ^{8}}

= \frac{9}{2 b ^{8}} - \frac{9}{2 b ^{9}}

e x p an d 3 (y + 100 = 3000)

e x p an d \frac{94}{3 ( 1 - 6 x ) ^{2}}

e x p an d tan (π (x - 0.5))

e x p an d 2 x (y - 3) - 3 δ (y - 1)

e x p an d 2 + \frac{1}{2}