展开-((-3x+1)(93x+7))/(1017)

解答

展开

- \frac{( - 3 x + 1 ) ( 93 x + 7 )}{1017}

\frac{31 x ^{2}}{113} - \frac{8 x}{113} - \frac{7}{1017}

求解步骤

- \frac{( - 3 x + 1 ) ( 93 x + 7 )}{1017}

乘开

(- 3 x + 1) (93 x + 7) : - 279 x^{2} + 72 x + 7

= - \frac{- 279 x ^{2} + 72 x + 7}{1017}

使用分式法则:

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

\frac{- 279 x ^{2} + 72 x + 7}{1017} = - (- \frac{279 x ^{2}}{1017}) - (\frac{72 x}{1017}) - (\frac{7}{1017})

= - (- \frac{279 x ^{2}}{1017}) - (\frac{72 x}{1017}) - (\frac{7}{1017})

去除括号:

(a) = a, - (- a) = a

= \frac{279 x ^{2}}{1017} - \frac{72 x}{1017} - \frac{7}{1017}

消掉

\frac{279 x ^{2}}{1017} : \frac{31 x ^{2}}{113}

= \frac{31 x ^{2}}{113} - \frac{72 x}{1017} - \frac{7}{1017}

消掉

\frac{72 x}{1017} : \frac{8 x}{113}

= \frac{31 x ^{2}}{113} - \frac{8 x}{113} - \frac{7}{1017}

e x p an d - \frac{1}{4} (x^{2} + 1) e^{2 x}

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

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

e x p an d (x - y = 5,) (x + 2 y = 7)

e x p an d \frac{x}{( x - 2 ) ( x - 3 ) ( s - 6 )}