问题
解答题
把下列各式因式分解
(1)x(x-y)+y(y-x)
(2)(a+b)2-4(a+b)+4.
答案
(1)x(x-y)+y(y-x)
=x(x-y)-y(x-y)
=(x-y)2.
(2)(a+b)2-4(a+b)+4=(a+b-2)2.
把下列各式因式分解
(1)x(x-y)+y(y-x)
(2)(a+b)2-4(a+b)+4.
(1)x(x-y)+y(y-x)
=x(x-y)-y(x-y)
=(x-y)2.
(2)(a+b)2-4(a+b)+4=(a+b-2)2.