问题
解答题
分解因式
(1)x2-2xy+y2-9
(2)n2(m-2)-n(2-m)
答案
(1)x2-2xy+y2-9
=(x-y) 2-9
=(x-y+3)(x-y+3);
(2)n2(m-2)-n(2-m)=n(m-2)(n+1).
分解因式
(1)x2-2xy+y2-9
(2)n2(m-2)-n(2-m)
(1)x2-2xy+y2-9
=(x-y) 2-9
=(x-y+3)(x-y+3);
(2)n2(m-2)-n(2-m)=n(m-2)(n+1).