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2х+у+у во второй степени-4х во второй степени
1-х во второй степени+2ху-у во второй степени
2х+у+у^2-4х^2=2x+y+(y-2x)(y+2x)=(y+2x)(1+y-2x)
1-х^2+2ху-у^2=1-(x-y)^2=(1+x-y)(1-x+y)
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2х+у+у^2-4х^2=2x+y+(y-2x)(y+2x)=(y+2x)(1+y-2x)
1-х^2+2ху-у^2=1-(x-y)^2=(1+x-y)(1-x+y)
2х+у+у^2-4х^2=2x+y+(y-2x)(y+2x)=(y+2x)(1+y-2x)
1-х^2+2ху-у^2=1-(x-y)^2=(1+x-y)(1-x+y)