Разложить на множители x-y-2x^2+2y^2
x-y-2x^2+2y^2=2(y^2-x^2)+x-y=-2(x-y)(x+y)+(x-y)=(x-y)(x+y-2)
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x-y-2x^2+2y^2=2(y^2-x^2)+x-y=-2(x-y)(x+y)+(x-y)=(x-y)(x+y-2)