问题 解答题

1-4x2-4y2+8xy.

答案

1-4x2-4y2+8xy,

=1-(4x2+4y2-8xy),

=1-4(x-y) 2

=[1-2(x-y)][1+2(x+y)],

=(1+2x-2y)(1-2x+2y).

多选题
单项选择题