展开 (-1+sqrt(1-4(-pi-4pin)))/2

解答

展开

\frac{- 1 + 1 - 4 ( - π - 4 πn )}{2}

- \frac{1}{2} + \frac{1 + 4 π + 16 πn}{2}

求解步骤

\frac{- 1 + 1 - 4 ( - π - 4 πn )}{2}

乘开

1 - 4 (- π - 4 πn) : 1 + 4 π + 16 πn

= \frac{- 1 + 4 π + 16 πn + 1}{2}

使用分式法则:

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

\frac{- 1 + 1 + 4 π + 16 πn}{2} = - \frac{1}{2} + \frac{1 + 4 π + 16 πn}{2}

= - \frac{1}{2} + \frac{4 π + 16 πn + 1}{2}

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