展开 (2(8-b))/b

解答

展开

\frac{2 ( 8 - b )}{b}

\frac{16}{b} - 2

求解步骤

\frac{2 ( 8 - b )}{b}

乘开

2 (8 - b) : 16 - 2 b

= \frac{16 - 2 b}{b}

使用分式法则:

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

\frac{16 - 2 b}{b} = \frac{16}{b} - \frac{2 b}{b}

= \frac{16}{b} - \frac{2 b}{b}

消掉

\frac{2 b}{b} : 2

= \frac{16}{b} - 2

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