x^2 - x - y^2 -y = (x^2 - y^2) - (x + y) = (x-y)(x+y) - (x+y) = (x+y)(x-y-1)
х²-х-у²-у=(х²-у²)+(-х-у)=(х-у)(х+у)-1(х+у)=(х+у)(х-у-1)
x^2 - x - y^2 -y = (x^2 - y^2) - (x + y) = (x-y)(x+y) - (x+y) = (x+y)(x-y-1)
х²-х-у²-у=(х²-у²)+(-х-у)=(х-у)(х+у)-1(х+у)=(х+у)(х-у-1)