展开 (3(x+4))/x

解答

展开

\frac{3 ( x + 4 )}{x}

3 + \frac{12}{x}

求解步骤

\frac{3 ( x + 4 )}{x}

乘开

3 (x + 4) : 3 x + 12

= \frac{3 x + 12}{x}

使用分式法则:

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

\frac{3 x + 12}{x} = \frac{3 x}{x} + \frac{12}{x}

= \frac{3 x}{x} + \frac{12}{x}

消掉

\frac{3 x}{x} : 3

= 3 + \frac{12}{x}

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