化简 (7x^2-x-1)-(x^2+3x+3)

解答

化简

(7 x^{2} - x - 1) - (x^{2} + 3 x + 3)

6 x^{2} - 4 x - 4

求解步骤

(7 x^{2} - x - 1) - (x^{2} + 3 x + 3)

使用法则:

(a) = a

(7 x^{2} - x - 1) = 7 x^{2} - x - 1

= 7 x^{2} - x - 1 - (x^{2} + 3 x + 3)

使用分配律:

- (a + b) = - a - b

- (x^{2} + 3 x + 3) = - x^{2} - 3 x - 3

= 7 x^{2} - x - 1 - x^{2} - 3 x - 3

对同类项分组

= 7 x^{2} - x^{2} - x - 3 x - 1 - 3

e x p an d (7 y - 3) (2 y - 1)

e x p an d [3 (2 y + 3 b) + 7] [7 (2 y + 3 b) - 7]

s im pl i f y \frac{7}{3 + 2}

s im pl i f y \frac{7}{12} + \frac{5}{9}

s im pl i f y 2 (x + 1)^{2} + 1