展开 (x-3xy)(-5x+4xy)

解答

展开

(x - 3 x y) (- 5 x + 4 x y)

- 5 x^{2} + 19 x^{2} y - 12 x^{2} y^{2}

求解步骤

(x - 3 x y) (- 5 x + 4 x y)

Apply FOIL method

(x - 3 x y) (- 5 x + 4 x y) : - 5 x^{2} + 19 x^{2} y - 12 x^{2} y^{2}

= - 5 x^{2} + 19 x^{2} y - 12 x^{2} y^{2}

s im pl i f y (- 3.6 x + 9.4) - (1.9 x + 3.6)

e x p an d (2 x^{2} - 5 y)^{2}

f a c t or 4 x^{2} - 5 x - 9

e x p an d 3 x (x - 3)

e x p an d 3 x (x + 5)