（x-2y）²+16y-8x+16

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（x-2y）²+16y-8x+16（x-2y）²+16y-8x+16（x-2y）²+16y-8x+16（x-2y）²+16y-8x+16=（x-2y）²

（x-2y）²+16y-8x+16
（x-2y）²+16y-8x+16

（x-2y）²+16y-8x+16
（x-2y）²+16y-8x+16
=（x-2y）²-8(x-2y)+16
=(x-2y-4)²