展开 ,(120-a-(120-a)/2)

解答

展开

120 - a - \frac{120 - a}{2}

\frac{a}{2} + 60 - a

求解步骤

120 - a - \frac{120 - a}{2}

使用分式法则:

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

\frac{120 - a}{2} = - (\frac{120}{2}) - (- \frac{a}{2})

= 120 - a - (\frac{120}{2}) - (- \frac{a}{2})

去除括号:

(a) = a, - (- a) = a

= 120 - a - \frac{120}{2} + \frac{a}{2}

数字相除:

\frac{120}{2} = 60

= 120 - a - 60 + \frac{a}{2}

数字相减:

120 - 60 = 60

= \frac{a}{2} + 60 - a

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