展开 (5x^2-9x+19)/((x-4)(x^2+5))

解答

展开

\frac{5 x ^{2} - 9 x + 19}{( x - 4 ) ( x ^{2} + 5 )}

\frac{5 x ^{2} - 9 x + 19}{x ^{3} + 5 x - 4 x ^{2} - 20}

求解步骤

\frac{5 x ^{2} - 9 x + 19}{( x - 4 ) ( x ^{2} + 5 )}

乘开

(x - 4) (x^{2} + 5) : x^{3} + 5 x - 4 x^{2} - 20

= \frac{5 x ^{2} - 9 x + 19}{x ^{3} + 5 x - 4 x ^{2} - 20}

e x p an d (b c + d e)^{6}

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

e x p an d (f^{'} (t) sin (t) + f (t) cos (t))^{2}

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

s im pl i f y (x + 3 - 23) (x + 3 + 23)