展开 (5(4sqrt(2)+1))/(31)

解答

展开

\frac{5 ( 4 2 + 1 )}{31}

\frac{20 2}{31} + \frac{5}{31}

十进制

1.07368 \dots

求解步骤

\frac{5 ( 4 2 + 1 )}{31}

乘开

5 (42 + 1) : 202 + 5

= \frac{20 2 + 5}{31}

使用分式法则:

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

\frac{20 2 + 5}{31} = \frac{20 2}{31} + \frac{5}{31}

= \frac{20 2}{31} + \frac{5}{31}

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