展开-(3(1+sqrt(249)))/(20)

解答

展开

- \frac{3 ( 1 + 249 )}{20}

- \frac{3}{20} - \frac{3 249}{20}

十进制

- 2.51696 \dots

求解步骤

- \frac{3 ( 1 + 249 )}{20}

乘开

3 (1 + 249) : 3 + 3249

= - \frac{3 + 3 249}{20}

使用分式法则:

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

\frac{3 + 3 249}{20} = - (\frac{3}{20}) - (\frac{3 249}{20})

= - (\frac{3}{20}) - (\frac{3 249}{20})

去除括号:

(a) = a

= - \frac{3}{20} - \frac{3 249}{20}

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