分解因式. (1)x2-9y2; (2)2x2y-8xy+8y; (3)m3(a-2)+m(2-a).

问题描述:

分解因式.
(1)x2-9y2
(2)2x2y-8xy+8y;
(3)m3(a-2)+m(2-a).

(1)x2-9y2=(x+3y)(x-3y);
(2)2x2y-8xy+8y
=2y(x2-4x+4)
=2y(x-2)2
(3)m3(a-2)+m(2-a)=m(2-a)(m2+1).