Question

因式分解练习题（要有答案）

Answer 1

1-4(x-y)²

=1-[2(x-y)]²

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

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

4-x²-4xy-4y²

=4-(x²+4xy+4y² )

=4-(x+2y)²

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