4(x-2y)^2-8x+16y+3

问题描述:

4(x-2y)^2-8x+16y+3

4(x-2y)^2-8x+16y+3
=4(x-2y)^2-8(x-2y)+3
=[2(x-2y)-3][2(x-2y)-1]
=(2x-4y-3)(2x-4y-1)