展开-(2(7+sqrt(1939)))/(15)

解答

展开

- \frac{2 ( 7 + 1939 )}{15}

- \frac{14}{15} - \frac{2 1939}{15}

十进制

- 6.80454 \dots

求解步骤

- \frac{2 ( 7 + 1939 )}{15}

乘开

2 (7 + 1939) : 14 + 21939

= - \frac{14 + 2 1939}{15}

使用分式法则:

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

\frac{14 + 2 1939}{15} = - (\frac{14}{15}) - (\frac{2 1939}{15})

= - (\frac{14}{15}) - (\frac{2 1939}{15})

去除括号:

(a) = a

= - \frac{14}{15} - \frac{2 1939}{15}

e x p an d \frac{( x + 9 ) ( x + 10 )}{x - 9}

e x p an d 19 sin (\frac{π}{6} (x + 3)) + 21

s im pl i f y \frac{1}{2} + \frac{3}{92} (9 \cdot 0.3 - \frac{0. 3 ^{3}}{3})

e x p an d \frac{3 s ^{4} - 12 s ^{3} + 4 s ^{2} + 11 s + 4}{s ( s ^{2} - 3 s - 2 ) ^{2}}

e x p an d \frac{e ^{- x} + x}{x ( x - 3 ) ( x - 2 )}