展开-(3(7-2sqrt(5)))/(29)

解答

展开

- \frac{3 ( 7 - 2 5 )}{29}

- \frac{21}{29} + \frac{6 5}{29}

十进制

- 0.26150 \dots

求解步骤

- \frac{3 ( 7 - 2 5 )}{29}

乘开

3 (7 - 25) : 21 - 65

= - \frac{21 - 6 5}{29}

使用分式法则:

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

\frac{21 - 6 5}{29} = - (\frac{21}{29}) - (- \frac{6 5}{29})

= - (\frac{21}{29}) - (- \frac{6 5}{29})

去除括号:

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

= - \frac{21}{29} + \frac{6 5}{29}

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