问题 解答题

因式分解

(1)2x2-8xy+8y2

(2)x2(x-y)+(y-x)

答案

(1)2x2-8xy+8y2

=2(x2-4xy+4y2),

=2(x-2y)2

(2)x2(x-y)+(y-x),

=x2(x-y)-(x-y),

=(x-y)(x2-1),

=(x-y)(x+1)(x-1).

选择题
单项选择题 A3/A4型题