展开 (3(3-sqrt(2)))/7

解答

展开

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

\frac{9}{7} - \frac{3 2}{7}

十进制

0.67962 \dots

求解步骤

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

乘开

3 (3 - 2) : 9 - 32

= \frac{9 - 3 2}{7}

使用分式法则:

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

\frac{9 - 3 2}{7} = \frac{9}{7} - \frac{3 2}{7}

= \frac{9}{7} - \frac{3 2}{7}

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