因式分解. (1)x3-2x2+x; (2)4-x2-4xy-4y2.

问题描述:

因式分解.
(1)x3-2x2+x;
(2)4-x2-4xy-4y2

(1)原式=x(x2-2x+1)
=x(x-1)2
(2)原式=4-(x2+4xy+4y2
=4-(x+2y)2
=(2+x+2y)(2-x-2y).