化简 (6x^2-4x-5)-(3x^2-7x+2)

解答

化简

(6 x^{2} - 4 x - 5) - (3 x^{2} - 7 x + 2)

3 x^{2} + 3 x - 7

求解步骤

(6 x^{2} - 4 x - 5) - (3 x^{2} - 7 x + 2)

使用法则:

(a) = a

(6 x^{2} - 4 x - 5) = 6 x^{2} - 4 x - 5

= 6 x^{2} - 4 x - 5 - (3 x^{2} - 7 x + 2)

使用分配律:

- (a - b) = - a + b

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

= 6 x^{2} - 4 x - 5 - 3 x^{2} + 7 x - 2

对同类项分组

= 6 x^{2} - 3 x^{2} - 4 x + 7 x - 5 - 2

s im pl i f y 8 (2 x - 3) - 6 x

f a c t or 9 a^{3} b^{2} + 12 a^{4} b

s im pl i f y 356 - 3189

s im pl i f y - 9 (8 n + 4 p) - 7 p - 2 (- 10 p - 9 n)

s im pl i f y (4 x - 2) 2