展开 ((x+2)(x-1))/((x-4)(x+3))

解答

展开

\frac{( x + 2 ) ( x - 1 )}{( x - 4 ) ( x + 3 )}

\frac{x ^{2} + x - 2}{x ^{2} - x - 12}

求解步骤

\frac{( x + 2 ) ( x - 1 )}{( x - 4 ) ( x + 3 )}

乘开

(x - 4) (x + 3) : x^{2} - x - 12

= \frac{( x + 2 ) ( x - 1 )}{x ^{2} - x - 12}

乘开

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

= \frac{x ^{2} + x - 2}{x ^{2} - x - 12}

e x p an d (3 x + 5 y = 3, 3) (12 x - 7 y = 51)

e x p an d ln (q) (- \frac{1}{a} - 1)

e x p an d (- 3 x - 2) (\cdot + 2)

e x p an d - \frac{5}{81} (9 e^{9 x} x - e^{9 x})

e x p an d A^{'} (t) (π (2 - t)^{2})