展开 (3(7-sqrt(57)))/(20)

解答

展开

\frac{3 ( 7 - 57 )}{20}

\frac{21}{20} - \frac{3 57}{20}

十进制

- 0.08247 \dots

求解步骤

\frac{3 ( 7 - 57 )}{20}

乘开

3 (7 - 57) : 21 - 357

= \frac{21 - 3 57}{20}

使用分式法则:

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

\frac{21 - 3 57}{20} = \frac{21}{20} - \frac{3 57}{20}

= \frac{21}{20} - \frac{3 57}{20}

e x p an d \frac{- 5 w + 18}{( w + 1 ) ( w - 3 )}

e x p an d y^{'} (x) (x^{3} - cos (x))^{5}

e x p an d ln (3 z + 1)

e x p an d ((x + Δ x) - 1) (x - 1)

e x p an d a ((a - b) \cdot (a + 2 b))