展开 (2(8sqrt(2)-2))/5

解答

展开

\frac{2 ( 8 2 - 2 )}{5}

\frac{16 2}{5} - \frac{4}{5}

十进制

3.72548 \dots

求解步骤

\frac{2 ( 8 2 - 2 )}{5}

乘开

2 (82 - 2) : 162 - 4

= \frac{16 2 - 4}{5}

使用分式法则:

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

\frac{16 2 - 4}{5} = \frac{16 2}{5} - \frac{4}{5}

= \frac{16 2}{5} - \frac{4}{5}

e x p an d (- 1, - 1) y (3, - 2)

e x p an d \frac{2 ( 1 + 10 )}{3}

s im pl i f y (x + y i) (x - y i)^{2}

e x p an d arcsec (1)

e x p an d \frac{( a + b ) ^{2}}{2}