展开 ((p-l)D)/(lv^2)

解答

展开

\frac{( p - l ) D}{l v ^{2}}

\frac{p D}{l v ^{2}} - \frac{D}{v ^{2}}

求解步骤

\frac{( p - l ) D}{l v ^{2}}

乘开

(p - l) D : p D - l D

= \frac{p D - l D}{l v ^{2}}

使用分式法则:

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

\frac{p D - l D}{l v ^{2}} = \frac{p D}{l v ^{2}} - \frac{l D}{l v ^{2}}

= \frac{p D}{l v ^{2}} - \frac{l D}{l v ^{2}}

消掉

\frac{l D}{l v ^{2}} : \frac{D}{v ^{2}}

= \frac{p D}{l v ^{2}} - \frac{D}{v ^{2}}

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