(1)a^3-9a (2)x^2(a-b)+(b-a) (3)(x-3)^2-4 因式分解,求大大们帮助,
问题描述:
(1)a^3-9a (2)x^2(a-b)+(b-a) (3)(x-3)^2-4 因式分解,求大大们帮助,
答
(1)a^3-9a
=a(a-3)
(2)x^2(a-b)+(b-a)
=(a-b)(x^2-1)
=(a-b)(x-1)(x+1)
(3)(x-3)^2-4
=(x-3-2)(x-3+2)
=(x-5)(x-1)