展开 (4(2n+4))/n

解答

展开

\frac{4 ( 2 n + 4 )}{n}

8 + \frac{16}{n}

求解步骤

\frac{4 ( 2 n + 4 )}{n}

乘开

4 (2 n + 4) : 8 n + 16

= \frac{8 n + 16}{n}

使用分式法则:

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

\frac{8 n + 16}{n} = \frac{8 n}{n} + \frac{16}{n}

= \frac{8 n}{n} + \frac{16}{n}

消掉

\frac{8 n}{n} : 8

= 8 + \frac{16}{n}

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