展开 ((x-2)(x+1))/(x-4)

解答

展开

\frac{( x - 2 ) ( x + 1 )}{x - 4}

\frac{x ^{2} - x - 2}{x - 4}

求解步骤

\frac{( x - 2 ) ( x + 1 )}{x - 4}

乘开

(x - 2) (x + 1) : x^{2} - x - 2

= \frac{x ^{2} - x - 2}{x - 4}

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

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

e x p an d (1 - 3 x) (x + 2)^{'}

e x p an d 2 t (2 t - 2)

e x p an d [(x + 1) (x - 1)] 2