因式分解
(1) x3+2x2y+xy2
(2)m2(m-1)+4(1-m)
【解析】利用平方和和平方差因式分解
(1) x3+2x2y+xy2
= x(x2+2xy+y2)
= x(x+y) 2
(2) m2(m-1)+4(1-m)
= (m-1) ( m2-4)
= (m-1) ( m+2) ( m-2)