化简 (2x+1)(4-9x)-2x(3x+11)

解答

化简

(2 x + 1) (4 - 9 x) - 2 x (3 x + 11)

- 24 x^{2} - 23 x + 4

求解步骤

(2 x + 1) (4 - 9 x) - 2 x (3 x + 11)

展开

(2 x + 1) (4 - 9 x) : - 18 x^{2} - x + 4

= - 18 x^{2} - x + 4 - 2 x (3 x + 11)

展开

- 2 x (3 x + 11) : - 6 x^{2} - 22 x

= - 18 x^{2} - x + 4 - 6 x^{2} - 22 x

对同类项分组

= - 18 x^{2} - 6 x^{2} - x - 22 x + 4

s im pl i f y \frac{7}{8} + \frac{5}{6}

e x p an d (x - y) \cdot (x + y)

s im pl i f y - 9 (1 - 10 n) - 2 (3 n + 9)

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

\frac{60}{9}