представьте вырождение в виде произведения двух многочленов:
3c(x-y)-2d(x-y)
3ab(x+2y)+c²(x+2y)
3c(x-y)-2d(x-y)
3ab(x+2y)+c²(x+2y)
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3c(x-y)-2d(x-y)=(x-y)(3c-2d)3ab(x+2y)+c^2(x+2y)=(x+2y)(3ab+c^2)